Surprise under the bed!
This prank teaches sisters to think twice when pranking you! If you are small enough, hide under the bed when your sister is out of the room. Then, have one other sibling tell her that he/she wants to show her a magic trick, then they will tell her to stick her feet on the edge of the bed. Finally, Surprise!!! The one under the bed will scream and grab her legs. She will surely get a surprise and check the bed from now on!