Astral-projection happened to me when I was at last period in 9th grade and I noticed on a lightswitch, for four set of lights, that one was missing. Everyone was standing up, waiting for the final bell, I was near the door where the lights were and tried to turn off the lights from the inside.
I saw my entire class and my teacher even though my back was turned to them and I was pulling away at fourty-five degree angle.
That was fun, it made the time go by. Next thing I knew, I was standing back at the wall, near the door, the bell rang, and I left.