More gems from mutedfaith.com's list of famous last words before an untimely demise:

"The DM's an idiot." (possibly my favorite. -grins- of course that doesn't apply to Sam...)
"YO! Grendel! Your momma wears combat boots!"
"I'll poke it with my sword.."
"No, I'm sure there's some stipulation that says a disintegrate spell won't work if the spellcaster casts it on himself. Here, I'll prove it."
"Ya know, since our druid's been so obnoxious, it would probably serve him right if we set his precious forest on fire." (or ate her hawk, eh Toes? hmph.)
--
Player: So uh, the goblins are all dead/gone right?
DM: Right.
Player: Huzzah! Well, I'll go ahead and jump down from the tree now... ::long pause:: OH Shit!! The caltrops!
--
"Nah, we won't take watch."
"I'm going to sleep."
"I thought HE had watch..!"