Oooh...that's evil!
EVIL PC: Ok, I want to wait until they're all sleeping, and then kill them all!
DM: Ok, you've done that. They're all dead.
OTHER PCs: What????
DM: Now, if you don't mind, I'm going to go out for dinner. See you guys next week.
OTHER PCs: That's it...get 'em!
EVIL PC...