I shall now quote the coop session I had a few hours ago. My dearest crack addicted pal Anarchyzombie9 and I tried to play the demo. I never ever have played a single RE game and I can't deny that I'm horrible, and he... well, he's not the best guide you can ask for.

First time noticing that you have to work as a team...
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Anarchyzombie9: Stay away from the ledge so I can snipe him.
BraindeadRacr: How do I preform knife attacks?
Anarchyzombie9: There's one sneaking up to you on your right - BAM!
BraindeadRacr: These controls are so goddamn Japanese.
Anarchyzombie9: Man you suck...
BraindeadRacr: JESUS THEY'RE ALL OVER ME! HOW DO I KNIFE ATTACK FOR THE LOVE OF ALL THAT IS HOLY!

The "villagers" come at you with a selection of axes and beer bottles...
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Anarchyzombie9: Ahh he just broke a bottle on my head. Racism!
BraindeadRacr: UPPERCUT.

There's a part where the rugged American stud informs a certain Kirk of the situation.
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Anarchyzombie9: The villagers are hostile!? DIDNT NOTICE AT ALL.
BraindeadRacr: NU-HUH.

In the same chapter, we tried holing up into the building until the big guy-boss thing comes up...
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BraindeadRacr: Watch the door, I'll cover the window.
Anarchyzombie9: *bashes the door out* God I love doing that...
BraindeadRacr: Just watch that side...
Anarchyzombie9: *Help sign* He beat me with a bottle!
Anarchyzombie9: OHHH UPPERCUT.

Also, there's a lovely way of how the game treats packrats. Y'know, the people who nick all the ammo and leave you dry. It does nothing, you gotta deal with it.
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Anarchyzombie9: You took all the pistol ammo? You dick.
BraindeadRacr: You have a shotgun, so fuck you.
Anarchyzombie9: IT HAS SIX SHOTS!
BraindeadRacr: Well, I have a sniper rifle which is useless.
Anarchyzombie9: Fuck you NJ.

When blaming one another for our deaths
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Anarchyzombie9: You suck, man.
BraindeadRacr: I revived you NINE times!
Anarchyzombie9: Anyone around in this party who has the Resident Evil 5 demo and who doesn't suck?
BraindeadRacr: I'm the one playing as a damn woman, with a fucking useless sniper rifle, and you died.
Anarchyzombie9: You still suck, man.
BraindeadRacr: Lemme play as the dude with the shotgun.

Three minutes later...
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Anarchyzombie9: I told you to use the shotgun ammo!
BraindeadRacr: No, no, no... You told me to save the shotgun ammo.
Anarchyzombie9: Yeah, for a time when it could be useful!
BraindeadRacr: You told me to wait until the big dude came out!
Anarchyzombie9: He did, didn't he now?
BraindeadRacr: I was being attacked! Where the fuck were you!?
Anarchyzombie9: Hidin'.
BraindeadRacr: Let's play Castle Crashers.