>>113Write the note in a nonspecific manner, as if you didn't know who would be reading it.
Some other ideas:
-full scavenger hunt, with a copy of the principia discordia at the end. Just make sure it's fairly convoluted so that only people with a spark of curiosity will follow it through to the end.
-if you're underaged and still in high school
like I am, you can type random memebombs into the graphing calculators just before class ends.