The game is GURPS, I'm playing a member of a reptiloid underground race who's currently in an elven village and has just waken up with a nasty hangover from being drunk the evening before.
 Me (doing my best hangover acting): "Mrgrz..."
 Elf: "Wake up, we've got to go, it's late"
 Me: "What's that shiny yellow thingy in the sky?"
 Elf: "It's the sun!"
 Me: "...put it off..."
 
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 Another time, in a kinda low-roleplaying, epic-level, beer-n-pretzels game, I was talking to the ruler of a powerful city-state.
 Me: "You 
will do what I say".
 NPC: "Mind what you say!"
 Me (rolling): "He is bloody well going to do what I say. Diplomacy!"
 DM: "You aren't actually being much diplomatic. What have you rolled?"
 Me: "49"
 DM: "Uh... ok..."
 
 Same game, some time later.
 Me: "I ready an action to counterspell".
 DM: "Ok, next..."
 Me: "Hey, wait! I also cast two maximized polar rays at him"
 DM: "Just how many quickened spells do you have?"
 Me: "
All of them, duh!"
 
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 Elf has just climbed a tree in a thick forest to see where we're going.
 Party: "What do you see from up there?"
 Elf: "Laaaaand in siiiiiight!!"
 
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 Playing Vampire.
 ST: "Roll willpower, target number 6".
 Me: "Fail"
 Other guy: "Botch"
 Me: "No, with the new rules you only botch if you roll no successes at all"
 Other guy: "Oh, ok. Then it's a fail"
 
 Some time later (after some running and screaming).
 ST: "Roll willpower, target number 6".
 Me: "Double botch... uhm, I'm spending a willpower point to cancel the botch"
 Other guy: "Uhm... I think I'll have to do the same"
 ST: *sigh*
 
 Much time later (after much running and screaming).
 ST: "Roll willpower, target number 5".
 Other guy: "Botch... I'm spending another willpower..."
 Me: "Heck, I'm down to willpower 3, at least I can't roll more than 3 ones"
 *roll*
 Me: "Aaand... triple botch!"
 Other guy: "I suggest we just go back to the prince and tell him that this guy is too tough for us..."
 
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 Cyberpunk 2.0.2.0 game which has taken a star-trekkish turn. We're talking with some aliens.
 PC1, off the radio: "The sensors we have don't detect any weapons on their ship, I say we can take them on!"
 Me: "Uh... is your ship armed?"
 Aliens: "Lightly"
 Me: "What are your weapons capable of?"
 Aliens: "We only have small weapons here. We can destroy small planets"
 
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 Planescape, 
the Abyssal campaign, the PCs are fighting for their lives in the bowels of an Abyssal prison and the psion is being grappled by a monstrous bear.
 Psion: "Fireball them! I'm still in good health and I have excellent reflex saves and evasion!"
 Wizard: "Uhm... you sure?"
 Psion: "C'mon! You'll never get them this packed again!"
 Wizard: "Ok, fireball in the bunch of them"
 Wizard rolls.
 Wizard: "Uhm... you'd better make that roll, you know"
 Psion: "Fail. Well, I still have 54 HP, how much damage is it?"
 Wizard: "The Abyss automatically Enhances all evocations, I told you when we arrived here!"
 Psion: "So?"
 Wizard: "67!"
 Psion: "WHAT?"
 DM (me): "On the plus side, the bears are fried. Your imp familiar says 'nice shot boss! Next time have him sign his soul to you before though!'"
 
 Same game.
 DM: "The vrock lifts his arms and chants"
 PC: "Oh noo! He's summoning another one!"
 DM: "Another vrock appears in mid-air, covered in foam and dripping water, with a large brush and a piece of soap in its claws. It glares at the first demon and then at you"
 
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 Dragonlance (beer'n'pretzels game). I'm the DM.
 Alienist: "I'm going to summon a balor!"
 DM: "WhAt Do YoU aSk Of Me MoRtAl?"
 Alienist: "Mighty demon, smite my foes!"
 DM: "We WiLl HaVe To AgReE oN a SuItAbLe PaYmEnT..."
 Alienist: "What are thy requests?"
 DM: "Oh, I think about some thousand GPs and a dozen souls or so... maybe we can have lunch together to discuss the details"
 Alienist: "Uhm... what happened to the scary demon voice?"
 DM: "The fiend says that it makes his throat hurt"
 
 Same game, same alienist.
 Alienist: "I tire of this! I'm going to summon the biggest Pit Fiend I can find!"
 DM: "
WHO DARES SUMMON..."
 Cleric (w/ travel domain): "
Teleport without error away from here!"
 DM: "...
BAALZEPHON OF THE DARK EIGHT?"
 Rest of the party: "We jump on the cleric! Get us out too!"
 Alienist: "...bastards"