1) First buy maybe two bags of crickets from a pet store (they can't be to expensive can they?), but make sure they're crickets and not grasshoppers, because they won't chirp.
2) Bring them to school and ask to go to the washroom and set them free in the ceiling (the tiles should lift up if your school is like mine).
3) Dispose of the evedence, go to class and wait for the chirping little buggers to migrate.
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