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Your roommate will think you left them a tasty treat, when in reality they'll be getting a mouthful of flavors like Skunk Spray and Canned Dog Food.
They won't sleep for weeks once they find this baby between their sheets.
Who says clowns can't be funny?
Bonus game: Pin the smell on them and watch how confused they get.
Nothing will annoy a person more than repeatedly turning off the show they're watching. Your roommate will have no idea what's going on.
They'll be saying more than they realize on their morning commute.
Really wake them up when they're going to make their breakfast in the morning.
The next time your roommate flushes, they'll have their own minature version of The Shining. Sure, it could make a huge mess, but isn't it worth it if it means freaking out your roommate?