Lights Out!
It was the end of the semester, and me and this girl had to take our books to the old book room. When we got to the gym, we tried to turn on the lights, but they wouldn't come on. We didn't think anything was wrong, and we said, "We'll only be in here a second, so we don't need the lights. When we got in the book room, we turned on those lights instead. Then, we came out, and (with the light switch turned off) the lights came on! I was so freaked out, I pushed the girl down and ran away as fast as I could!