History Funny / Left4Dead

* Each of the chapter endings are potentially hilarious as the [[ArtificialStupidity zombie AI bugs out]] since the player characters are in escape vehicles they can no longer get to. Tanks will sometimes inexplicably die, zombies will run off buildings like lemmings, or do silly walk cycle animations.

*** In the custom campaign "Blackout Basement", one of the safe rooms contains graffiti that writes that the [=CEDA=] trucks are going to send people to "[=CEDA=] death camps". Just like the aforementioned "WE ARE THE REAL MONSTERS" graffiti, it's followed by {{Troll}}-like responses like "DUMB SHIT" written in red ink, another response is saying [[CrapsackWorld the city itself is already a death camp]], while another writes "[[TooDumbToLive I was hoping all of these dumbasses would have become zombies by now]]"
*** Note: this is a real conspiracy theory, only about FEMA, the real life version of CEDA. Your faith in humanity just dropped a bit.

'''Francis''': Whoa. Must have [[NonSequiterThud hit my head]] in the crash. I'm okay now. I hate helicopters.

'''Francis''': Whoa. Must have [[NonSequitorThud hit my head]] in the crash. I'm okay now. I hate helicopters.

--> '''Coach''': Into the Tunnel of Love
--> '''Nick''': Tunnel of Love? Jesus Christ!

* In the beginning of Crash Course
--> '''Francis''': Goddamnit, where'd they buy this helicopter? At the ... uh... um... hold on...
--> '''Zoey''': The shitty pilot store?
--> '''Francis''': Yeah! Stupid helicopter.

** Ellis can even affix it to weapons that spawn inside the tunnel.

--> '''Cop:''' (unconvienced) Okay, officer. And why are you stealing a flatscreen TV?\\

'''Cop:''' (unconvienced) Uh-huh. And which crime would that be?\\

*** [[DeadpanSnarker "It's like a five-year-old with guns.]] [[ClusterFBomb And a comprehensive grasp of every swear word in the English language."]]

** In dark Carnival's finale you can find wall posts in the safe room about Night Riders being dead and all the replies say positive/loving things about the band, but than a new post reveals they are fine and they escaped in a helicopter, ''immediately'' the replies become more negative, saying the band had always sucked, and that they're all cowards.

-->{{YOUR MOM}}[[ShapedLikeItself IS A MOM]]

-->[[ShapedLikeItself YOUR MOM IS A MOM]]

'''Nick''': IT'S TWELVE-FEET TALL, SIX-FEET WIDE, HOW ARE YOU MISSING!?

* If you fall on a zombie, from any height, you take no damage and it dies.

** [[MemeticMutation Cool story bro!]]"
** "Jesus, lady. I'm hiding from zombies and reading this was the most terrible thing to happen to me today."
** "Alison, Reading your poem ruined heaven. Thanks a lot, Jonathan's Ghost."

* Thanks to mods, it is possible to invoke SoundtrackDissonance in the game. Wanna hear [[Disney/WreckItRalph Sugar Rush]] play while you're trying to avoid getting crushed by a Tank? No problem. Wanna have Living in the Sunlight play in the background as a Witch chases you? You got it. The possibilities are endless and hilarious.

** In dark Carnival's finale you can find wall posts in the safe room about Night Riders being dead and all the replies say positive/loving things about the band, but than someone a new post reveal their fine and they escaped in a helicopter, ''immediately'' the replies become more negative, saying saying the band had always sucked, and that their all cowards.

** In dark Carnival's finale you can find wall posts about Night riders being dead and all the replies say positive/loving things about, than someone reveal their fine, escaped in a helicopter, ''imediately'' the replies become more negative, saying the band is lame and sarcastic comments about how rich they are.

** 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.

--> '''Cop:''' Okay, officer. And why are you stealing a flatscreen TV?\\

'''Cop:''' Uh-huh. And which crime would that be?\\

** Also done in one of the Crash Course safehouses, where an 'Alison' writes a {{Glurge}}-y TastesLikeDiabetes poem about their beloved Jonathan, who died. The poem is torn apart in an identical manner. "PS IM FAT", "[[MemeticMutation Cool story bro!]]", "Dear Alison / 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."
** Dear Alison, you ruined heaven for me. thanks, Jonathan's ghost.
** My god, she could have been a Vogon for all we know!

** Also done in one of the Crash Course safehouses, where somebody writes a {{Glurge}}-y TastesLikeDiabetes poem about somebody who died, and is ripped apart in an identical manner. "PS IM FAT", "[[MemeticMutation 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."

** Dear [writer], you ruined heaven for me. thanks, spirit of [subject of the poem]

--> '''Coach''': BOY, QUIT POINTIN' THAT THING MY WAY!

--> '''Nick''': Yeah, no, I'm good. I'm good.

* 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 CrowningMomentOfAwesome.