The mystery of where the fuck my last bag of onion rings went. They were in my cupboard in the kitchen, but the only guy who was around at that time said it wasn't him. It couldn't have been anyone else, as they were all in lectures, and if it wasn't him, then it's just this great big mystery.
Also the mystery of why his room smelt of onion rings.
And the mystery of why there was onion rings dust in his room.
And finally, the mystery of what happened to that guy.