Skeleteen Disappearing Trick Knife - Retractable Fake Plastic Blade - Costume Prop or Prank Gag Toy for Halloween, April Fools - 7.5 Long with 3 Blade

A HILARIOUS PRANK: Trick your friends into think you just stabbed yourself with a dangerous knife with this super cool disappearing prank toy knife that will definitely shock unsuspecting onlookers.
RETRACTABLE MECHANISM: The 3 blade immediately retracts into the handle once it makes contact with your skin! It gives the illusion that it went deep within your body like it's magic!
100 Percent PLASTIC AND SAFE: The blade is not sharp whatsoever and made of durable plastic so it wont cut and wont break easily so don't worry about accidents when you're trying to shock your friends!