"Blood preasure, boss" (said to a raging barbarian/cleric)
Solar-Turned-Evil: "Your path ends here, you will never pass me, but pass on you will" (or something like this)
Our Dwarf Wizard: "Oh yeah? Let's roshambo it!" (followed by some maximized, empowered meteor swarm that downed the fallen angel instantly)
Some PC: "Does anyone have a magic weapon to hurt that thing?"
Drow Priest: "I have a +1 Handbrake"
Everyone else: "???"
Drow Priest: "Uh, I mean hand crossbow"
Evil Wizard: "Yes, you can kill me, but then you'll never get the information you seek so desperately and which only I have."
Psion (in matter-of-fact voice): "We have a cleric. She can speak to the dead."
Priestess: "I'll take the sorcerer's spear and put it into any hole I can find."
Sorcerer: "

.... you know what? Why don't you keep that spear? I'll get another"
Priestess: "Your mother" (that was the cue for the rest of us to close our eyes while the priestess cast that nymph spell that makes people blind. The player thought this was hilarious)
BBEG: "Yes, it is I who killed your kind. Not me personally, of course, I have my henchmen for that. This creature beside me, for example, has plenty of notches in his axe, although he doesn't have an axe."
Our bladesinger: "Oooh, captain eloquent."