This gimmick hidden in your hand makes a large cracking noise when you squeeze it. Just pretend to crack your neck by twisting it. Squeeze the hidden gimmick in your hand and it will create a terrifying real cracking sound. Pretend to crack an audience members neck! Easy to use just expand device by pulling and crush it to make the popping sound. Can be used over and over. Make it look like your cracking your arm, knuckles, etc.