Yes, I know this has been done before, but I searched every term I could think of, and nothing came up. I apologize in advance.
See, at my little sister's middle school, a class turned off all the lights--to watch a movie, you know? In the middle of it, the teacher heard a noise, like someone was moaning.
She turned on the lights, and one of the students was in another's mouth underneath the desks.
True story, I'll give documentation as soon as I find it. I heard this through the grapevine, so no articles yet.
And no, it wasn't my sister, nor was it in her class.