What is a good April Day prank?

Here are a few prank ideas for April Fools' Day:

1. Change the desktop wallpaper: Change your boss or a friend's computer wallpaper to something funny or embarrassing, such as a picture of a pet or a funny meme.
2. Reverse all labels on food items: Switch all the labels on your roommate's food in the fridge, so they're completely different from what they actually are.
3. Fill a desk drawer with water: Place a piece of plastic wrap over the top of a colleague's desk drawer, then fill it with water. When they open the drawer, they'll be in for a surprise!
4. Rubber band the phone: Attach a rubber band to the bottom of your office phone, so that when someone tries to hang up, the rubber band pulls it back down.
5. Hide all the lightbulbs: Remove all the lightbulbs in the office or your home, so that when someone turns on the light, it doesn't work.
6. Replace the mouse with a remote control: Switch out a co-worker's computer mouse with a remote control, so when they try to use the mouse, they won't be able to move the cursor.
7. Hide the car keys: Hide your roommate's car keys somewhere unexpected, such as in the freezer or the dishwasher.
8. Fake an appointment: Send a fake calendar invite to a co-worker or friend, inviting them to a meeting that doesn't exist.
9. Plant a fake spider: Place a fake spider in a co-worker's desk drawer or on their computer keyboard to spook them when they find it.
10. Set an alarm clock: Set an alarm clock to go off in the middle of the night, but hide it somewhere in your roommate's room, such as under their bed or in their closet.

Remember, when pulling any pranks, be sure they are in good fun and not harmful to anyone.