Great Prank! "write on the wall"! Now doesn't that look like you wrote on someone's wall? You can even do this on someones id tag at work when they leave it hanging around, I'd use a sharpie though.
This is a pocket sized prank, so you can do it whenever you want!
What you need:

Dry Erase marker
Tape, i used the glossy kind.

Step 1: Put the Tape on the Wall.

Put the tape on the wall, and rub it down. Then, write a message, such as, "APRIL FOOLS!!!" or "Hi". Write whatever you want, Try to put it in a place where lots of people will see it.

You're done! Thanks for viewing.