What April Fools pranks did you play/were the victim of?

[aropower]

As you're taking the googly eyes off of your food in the fridge and changing your desktop back to normal after it was changed to the blue screen of death, April Fools is coming to an end.
You may discuss pranks you pulled or were the victim of, just keep it child-friendly and follow the CS rules.

So I guess I'll tell you about my pranks.
While the teacher was gone, I hid her water bottle and replaced it with a note that said 'No homework'. I also told everyone I brought brown e's. They got excited for some reason. Also, we did important tests yesterday and the teachers told us everybody had to redo them because they got ruined. Most of the class fell for it, but I didn't.

What pranks did you pull or were a victim of?
Just go crazy, as long as it's child-friendly.