The Arm
An unpopular young med. student had been particularly annoying one day and some of her classmates decided to play a trick on her. They snuck into her room
after she'd gone to bed and placed an amputated arm into bed with her. The next morning they anxiously awaited her reaction but got none. Eventually they
went up to check on her and found her sitting on the bed, moaning and gurgling as she gnawed on the arm.