What are good April fools pranks?

Answer 1

Here's what you do, get some cling film stretch over the toilet bowl, then put the toilet seat ring down. When someone goes to the restroom they will have a shock, as nothing will go down the pan.

Answer 2

if someone has siri on their phone, sneak their phone when they aren't looking and tell siri "Remind me to kill myself on April 1st." it will show up on April fools and say kill yourself at 9 a.m.