What's the Best April Fools' Day Prank You've Ever Been a Victim of or Perpetrated?

Gullible ones beware: April Fools' Day is here. 

If you want to pull a prank on this playful holiday, here are some fun and easy ideas to try: 

• Tape magnets to the bottom of an empty coffee cup, and attach it to the top of your car. Laugh at all the people who frantically try to get your attention as you drive by. — April Fool Zone 
• Super Glue some coins to the sidewalk or any spot that gets a lot of foot traffic. Make sure it's an appropriate place, then watch people try to get the coins. — Kidz World
• “Foil” a co-worker. — Instructables

Guyism offers several April Fools’ Day suggestions to try around the office:

• Borrow someone’s cell phone and change the language setting to a foreign language.
• Add several odd appointments with alarms set to go off during the day to a co-worker’s calendar.
• Hide all the desktop icons on someone’s computer and replace the monitor’s wallpaper with a screenshot of their desktop.
• Place a small piece of a Post-it note over the ball under someone’s computer mouse so it won’t work.

What is the best prank you've ever been a victim of or pulled on some poor unsuspecting April fool? Tell us in the comments.