Francis' hate of almost random things. "I hate vans." "I hate small towns." "I hate stairs." "I hate hospitals, and cops, and lawyers." And of course, "I hate Ayn Rand." He actually gets called out on this at one point.
Bill: Francis, is there anything you don't hate?
Francis: Know what I don't hate? I don't hate vests.
Hilariously turned around in the promo for The Passing when Francis and Rochelle seem to find something in common.
Rochelle: I hate those stairs.
Francis: I know!!
Rochelle: I hate that bridge!
Francis: It's so stupid!
Rochelle: I hate your vest!
Francis:...What now? Ugh. I don't think this is going to work out.
The notorious "WE ARE THE REAL MONSTERS" graffiti - not for the message it's trying to convey, but for the Troll-like responses scrawled underneath it...with the real kicker being the whimsical, "I miss the Internet."
Also done in one of the Crash Course safehouses, where somebody writes a Glurge-y Tastes Like Diabetes poem about somebody who died, and is ripped apart in an identical manner. "PS IM FAT", "Cool story bro!", "Dear Allison / Roses are red / Violets are blue / You suck", "Jesus, lady I'm hiding from zombies and reading your poem was the worst thing that happened to me today."
My god, she could have been a Vogon for all we know!
Any comment from a survivor hit by friendly fire and the dialog exchange between the survivors and the crazy church guy in Death Toll. Francis says it best:
Crazy Church Guy: Who's out there!?
Francis: Well let's see. I'm Francis, and that's Grandpa Bill, and THERE'S ZOMBIES OUT HERE, OPEN THE GODDAMN DOOR!
Louis: "Mister, if any of us die out here, I will shoot this door down and beat you to death with my gun!"
If you fall on a zombie, from any height, you take no damage and it dies.
Due to the collision detection if you walk over zombies that have not gotten up yet, you automatically kill them. With good timing and a bit of luck you can even run across the zombies' heads and use them as a bridge.
Boomers explode when they die. Like everything else, they take damage from falls, and can die from them. Since Infected will often leap off buildings to get from place to place, it's not uncommon to hear a Boomer explosion echo throughout an otherwise peaceful night. It's even more hilarious to watch it happen.
The sequel has its moments, too. Especially Ellis' Keith stories. Classic, just classic.
The locations of where the infected spawn are purely random, but sometimes they appear in the weirdest places. This troper once ran into a Tank inside the woman's bathroom!
In the Dark Carnival finale on higher difficulties, a huge horde tends to spawn in one of the small bathrooms on the way to the arena.
Speaking of the Infected, the Hunters seem to die in ways that make everyone on a server laugh a lot of the time due to the knockback of the weapons turned on it, and if he's in the air.
I once saw about twenty zombies spawn from between two rectangular pillars in a subway, simply because no one on the team was positioned in such a way that we could actually see between them. Also, pills in the sequel have a knack for spawning inside toilets. Usually upside-down. Good thing there seems to be only one disease in the game's universe.
This bit from The Parish, right after all the alarmed cars:
Nick: What do you know? We're gonna make it!
[A bomb explodes a few meters in front of them, taking out the bridge]
Nick: OH COME ON!
From The Passing:
Ellis: Aw, c'mon Coach, that biker guy seemed nice.
The reactions to friendly fire is sometimes over the top but also funny at the same time with lines like "GOD DAMMIT, WATCH YOUR FIRE!" or "I can't believe you just shot me again!" Some of the lines spoken in certain maps can also provoke laughter, such as this scene in the 4th map of Death Toll:
Louis: Riverside's a bust. Let's just head to the river.
Francis: That's better than my plan.
Bill: What was that?
Francis: I didn't have one.
Echoed in the sequel:
Coach: Maybe we can gas up that car and make our way out of here.
"My buddy Keith, lived in a graveyard once for a whole year. It wasn't a dare or nuthin', he just got kicked outta' his house..."
"We ain't got time for this, Ellis."
"Okay, but there WAS a goat."
How come this classic Ellis line isn't there yet?!
"Holy shit guys, KIDDY LAND!"
Coach while in the Mall.
"Please lord, let the food court be okay."
"... Poor food court never stood a chance..."
"If I see a zombie running up to me with a sample tray, I ain't shootin' it..."
Sometimes followed by this:
Rochelle: Dear lord, please have mercy on Coach and spare the food court.
Coach contacts the military, who ask him if he's encountered the infected. His reply: "Encountered?! Boy, I am covered in zombie blood and puke, and eyeballs, and twenty other parts I don't even recognize! We are as immune as shit!" Doubles as a Crowning Moment of Awesome.
After Coach suggests they use a rock concert to signal for rescue, Nick replies with "That's the stupidest plan I've ever agreed with."
How about this piece of alternate dialog, where Ellis sums up his plan?
After Zoey kills the helicopter pilot (who had turned into a zombie), Francis continues to tease her about it during Crash Course.
Francis: Just pretend they're all helicopter pilots, Zoey.
Zoey: He was a ZOMBIE, Francis!
The similar exchange from the sequel was also quite awesome.
Ellis: Nick, what the hell, you shot the pilot.
Nick: Well he wasn't doing a very good job once he became a zombie, now, was he?
Ellis: True, true, he was a zombie, but he was also our only pilot.
Nick: I shot a zombie. He was a zombie, Ellis. He must have gotten bitten before he picked us up.
From 'The Sacrifice' comic:
Part 1: The group gets rounded up by the military. Francis indicates Bill and says "I think you'd better cavity search him. He seems suspicious." Then, after the military starts dragging them along, "Oh, I get it! You guys want to cavity search each other!" His answer is a bash in the face by a machine gun butt.
And that's followed in Part 2, with Francis waking up in a cell next to Louis.
Francis: Did I get hit with a gun butt again?
Francis: Was it the guys I told to cavity search each other?
Louis: That'd be them.
Francis: Makes sense.
Later in the same comic, Francis taunting the two soldiers.
Jeff: Does he know we can't hear him?
Annie: I'm guessing not.
Pretty much the entirety of Francis' dream at the start of the fourth part.
Which turns into a disturbingly amusing Brick Joke later on in the comic. Louis getting his leg nearly torn off by a Witch? Not funny. Louis nearly getting his leg torn off by a whole boatful of BIKINI WITCHES?Actually Pretty Funny.
And then, when they find the other boat.
Francis: Louis, why don't you stick your leg in, see if there's any witches.
Francis gets sick of Louis' optimism and lets him know it, but one line he has for him in The Sacrifice always has me rolling:
Francis: Louis, if you don't stop being positive, I'm gonna sink that boat just to make you sad!
When Valve finally managed to fix an exploit in No Mercy's Left 4 Dead 2 port, this was the note that announced it.
"Fixed the fix of the fix of the fix of the door exploit in No Mercy"
Seeing a Tank kill one of its own as it tries to get to you. Hilarity Ensues if an AI controlled Tank kills a Hunter that pounced you or knocks you out of the Smoker's grip. Raging ensues if said AI Tank does this to you while playing as the infected in VS mode.
There's a downloadable map called "Fallen" that includes a massive tower, a land slide, and a wind turbine tunnel. Seeing zombies fall off of the tower by the dozen will make anyone laugh. The reaction to the surprise landslide and the water slide-like trip that ensues along with the survivors flying around with zombies in the wind tunnel is even more hilarious.
In the first level of the first campaign of Left 4 Dead 2, get a bile bomb jar and throw it off the ledge. Then watch as the zombies flood out of the building and run off the ledge.
Francis on teamwork: "Hey! Alright. While you guys were gone, I came up with a plan. To do this quicker, we should break up into teams. Guys, you're shirts. Everybody else, skins...Now let's go!"
This troper always cracks up when he hears this line:
Francis: I can't believe I'm saying this...but I think I wanna hang out with Louis!
Louis: Really? Thanks man!
And the opening for Left 4 Dead, we get this at the end:
Louis: I can't believe we made it!
Bill: Son, we just crossed the street. *lights cigarette* Let's not throw a party 'til we're out of the city.
This pair of lines from Nick and Ellis:
Nick: Your mom's car.
Ellis: See that was just uncalled for.
Coach's love of food produces a few great lines, including this one:
"Cotton candy, the wise pharaoh of food, sittin' a top the food pyramid, passing judgment on all the lesser foods."
At the end of The Passing, Zoey will occasionally say "Remember: Soylent Green is people."
The Midnight Riders Christmas song you can hear on the jukebox in The Passing. The lyrics are about kicking Santa's ass after he steals your woman.
This becomes even funnier when you read on the Youtube text for the song that they only made it in order to avoid 30,000 hours of community service. Before that, they had refused to do a Christmas charity album for children because it "just makes 'em weak, man."
Ever seen a Tank board your rescue vehicle? "Yakety Sax" comes to mind.
Hunters can occasionally do funny things, such as pouncing and missing you completely, or running headfirst into trees.
During The Sacrifice, Francis admits he has a legitimate fear and hatred of islands. Louis spends the next thirty seconds psyching up Francis, culminating in some of the funniest lines in context.
"Punk-ass bitch island, you better watch yo'self!"
This is best done from high places, like the beginning of Dead Air. Throw a pipe bomb, watch dozens of infected sprinting towards it, and then BOOM!