Re: "I shoot the escape pod!!!"
In one fantasy scenario I ran I had planned for the characters to storm an evil tower, kill the magician and save the kidnapped kids. The usual fare. A doppleganger was in the mix somehow, I can't remember why. I had planned for the d.ganger to disguise himself as a kid and mix in with the hostages and bump off the party one by one, starting with the NPCs of course.
Anyway one player encountered the 'kid' on the stair and not locked up, suspected foul play, and lopped it's head off.
Cue me needing to design another scenario for next week's game...