What is the biggest backstab or cross you've ever done or witnessed in game?
The one that stands out for me is DMing a small module where one of the rooms was designed as a test of temptation. it was a cool module overall that had riddles and jokes and such, very unorthodox. Anyways, the middle of the room had an altar with a beautiful statue of gold resting upon it. A single light was shining directly down on it, and directly behind the altar was a very large statue of a dragon. it was laid out to be pretty obvious that you shouldn't grab any of the treasure off the altar.
A guy in the group decided to go up and start to take the loot, but the whole party told him not to be a moron. he said alright, but as soon as the turned around he grabbed for his prize and got the whole part massacred.
Yea, they were pretty pissed after working so hard to get taken out by something like that.
What are some of yours?