Sometimes, the simplest ideas are the funniest and this a a good example. Take one pan, you hang it to the wall behind a door. You adjust it to be sure the pan is the same height that guy's face you want to prank. Put a stick to hold the pan and wait with a camera for you victim. Here it goes, you have this nice video of a guy slapping hard by a pan 🙂 The guy is really pissed of, this is really funny 🙂