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This is simple and effective. i got it from Revolver magazine so dont #*@! at me for ripping it off. Most schools have a tile ceiling. Well, all you have to do is lift on of those tiles and throw a raw (and preferably dead) fish up into the celing. Replace the tile and a couple of days later the classroom stink of raw fish, and no one will be able to figure out where its coming from. Also works in the bathroom.