When I was around 10 years old, I had a root canal done by my dentist. They had this gas you breath (they called it magic air iirc) to help with the pain. Problem is... Stuff didn't work on me. I could feel them drilling into my teeth, and it HURT like nothing I've ever felt since.
All the while I'm yelling best I can (Damned rubber screen-thing they prop up in your mouth) and the dentists are all like, "Oh, its OK, he can't really feel it"
Even if I couldn't really feel, and only thought I did (In which case my imagination can conjurer up some pretty hard core pain) it shouldn't have really mattered. They should have stopped and fixed the issue. They didn't.
EDIT: I apparently didn't notice the recent part of the title.
In which case probably when i got up at 3 in the morning in my apartment, feeling hungry. Pitch black, couldn't see a thing. the hall way leading to the kitchen from the bedroom has a closet on the left hand side, so I drifted my hand along it, turning left into the kitchen when it ended.
Yeah, the closet was open. i walked right into the wall.