Joke with nail polish (fake stain)
Oh scared, a stain on your favorite shirt ... April April!
April is already over, but worth a tip for next year. With that you can trick anyone, and the fool is relieved that it was just a joke.
You pour a little nail polish on a piece of baking paper or aluminum foil, which is allowed to dry well overnight (faster it goes with a hair dryer). Then cut only with scissors, done. The piece can be used again and again.
A very funny joke.