What was your biggest facepalm?

Very early in my Cataclysm experience I was searching a house and opened a bathroom door only to find myself face to face with a terrifying creature that I had never seen before. (Note: I was using Chesthole32 at the time) After flying into a noobish panic and nearly peeing myself I decided that the most sensible course of action was to eliminate it with extreme prejudice. I unloaded a burst from my sten into it which flew straight past it, out a window, and into the street where it promptly detonated the gas tank of an ambulance that was outside the house. A massive chain reaction ensued as the gas tanks of other cars lit up and the house that I was in was completely leveled. Burying both me and the completely harmless wolf suit that I had just finished trying to annihilate beneath the rubble.