Need a hand? The 17 Severed Shaking Arm will make sure you have all the help you need when creating a Halloween party that has plenty of perfect scares Leave this arm lying around or use it to recreate one of the classic gags when guests shake your hand, they'll be able to pull it right out. It will leave them shocked, of course, but it's all right. It's just a prop, one that you'll lose to use over and over.