BANG !!!!- WATCH OUT WHEN YOU LIFT UP THE TOILET SEAT- JUST PUT THE METAL SPRING UNDER THE SEAT- METAL SPARKLER STICKS ONTO THE TOILET - WHEN THE LID IS LIFTED IT FLINGS OPEN TO MAKE A SUPER LOUD BANG- YES THIS WILL SCARE YOUR FRIENDS - WHAT A GREAT PRACTICAL JOKE- THIS CAN BE USED ON OTHER OPENING ITEMS LIKE CUPBOARDS ECT..- METAL MECHANISM IS ABOUT 1 INCH LONG SO YOU CAN HIDE IT EASILY- JUST SET THE SPRING, STAND BACK AND GET READY TO LAUGH- YOU'LL HAVE A BANG WITH THIS JOKE NOVELTY