April Fool's Day - Post Your Best Prank

I heard a good one on the radio today. take a jolly rancher and cut it in half and put in behind someones shower head and screw it back on. It'll take them forever to realize why their so sticky!

My grandfather used to take ketchup packet and fold them in half. Stick them between the toilet seat and the bowl with the fold facing in. When someone sits down- surprise!