I was playing Left 4 Dead with my brother and I was going for the burn the witch achievement. She was on a separate rooftop so when I got her with the Molotov she ran off the side of the roof onto the street below. My brother and I are both standing on the edge of the roof (him on the roof that she was on and myself on the one next to it) looking down trying to find her. After about twenty or thirty seconds of looking I turn around to find her coming straight at me from across my roof all flailing and what not. Cue me screaming and running around in circles while my brother is laughing too hard to help me out and shoot her. We eventually got her and I never ended up getting pinned which was a freaking miracle. It had to be one of the funniest things that has happened to me during a game.