In our group, we always pick someone whose job it is to keep track of humorous quotes. Here are some samples from our last campaign:
Paladin: (after opening a package containing the bloody vest of the murdered Dwarf High Thane) Are we going to survive this day?
Psion: I don’t know. Quite possibly not.
Paladin (OOC): I don't see how that's so bad. I could come back a little ... well, dead.
Rogue: May the gods save me from religion!
Paladin: (after seeing fighter Feather Fall to the ground) How did you do that?
Fighter: What, fall?
Druid to Rogue (who is trying to act like nobility): So, how does the ceiling smell?
Sorceror(OOC): What if we threw a war and nobody came?!
Sorceror (OOC): I have twenty points of Charisma, and they’re in my pants!
Dwarf Wizard(OOC): Money doesn’t put undead on the table. Death puts undead on the table!
Dwarf Wizard(OOC): That’s your problem – you had the skeletons set on evil!
Fighter and Dwarf Wizard (OOC, to the tune of “Like a Virgin”): Like an undead! Risen for the very first time!
Druid (OOC): No, rerisen for the very second time!
Fighter ( OOC, about to attack a Troll): Can I Sunder his claws?
Fighter (OOC): I want to know if the door’s strong enough for me to break it down – just for future reference.
Sorceror to Dwarf Wizard: Perhaps you should find somewhere other than your bedroom for the Altar of the Gods, Korvar.
Paladin: One might as well ask why you are trying to destroy the nation of Everfast.
Sorceror: Um. Because it’s run by worshippers of Bane who seek unending warfare on all of mankind?
DM to Pirate: You take eighteen points of damage from being launched from a ballista.
DM: … and the Staff of Valunt drops the Staff …
Dwarf Wizard (OOC, trying to come up with verbal spell component): I’m just thinking of a magic word.
Fighter (OOC): Please?
Sorceror to Pirate and Paladin (who are shedding blood to open a Gate to Hell): Emery, Raief, stop what you’re doing.
Pirate: So my blood will be in vain, then?
DM (describing underworld demi-plane): Half the time, you’re being burned, tortured … the other half, you’re not.
DM (still describing underworld demi-plane): You do not die, though that is your first instinct.
DM to Sorceror: There is an emissary from the Tower of Divination there to see you.
Sorceror (OOC): Good, he’ll know I’m busy.
Pirate: I have two guesses – either it’s one of my brothers, or it’s Terrin … or I’m wrong. That’s my third guess.
Druid (OOC, looking at Dwarf whose arm was chopped off): Okay, I reincarnate his arm.
Dwarf Wizard to King (shortly after losing an arm): Do I have your permission to raid the armoury for a weapon to fit my current state of arms?
Fighter (requesting a ship for the party): Sans crew … not that I know French.
DM to Rogue: Is that a coup de grace?
Rogue (OOC): Well, since I don’t want him to wake up … yes.
DM to Fighter: He starts to attack.
Fighter (OOC): I start to kill him.
DM: … as your third return swing takes a chunk of him out of him.