Recently I attended a seminar on using simple magic tricks in the classroom. I learned a lot of great stuff, but could not master the art of making troublesome students disappear. Afterwards I stayed to talk to the psuedonumer magician, and asked if he knew of any great spots for a mystery cache, since he seemed to know a lot about mystery in general. He said 2 phrases to me that made no sense
Hammer a seesaw, whiny heavyweight.
Vote tongue, ham baby
I was pretty weirded out so I thanked him and left. Maybe you can find that magical spot.