The chick in the stall didn't lock the door. If I don't see a light, I just bust it open. I caught her right mid wipe while she was standing up. I think I was far more embarrassed than she was.

She quickly closed the door and I quickly made it back to my seat suddenly losing all desire to evacuate my bowels. (I also didn't want to be standing there when she did come out and have that "awkward moment"...)