Knife Through Arm Trick (watch video).
Show a large Knife, with Gleaming blade. Roll up your shirt sleeve and then in a Shocking display and with one swift movement, Smash the Blade of the Knife down on your forearm.
NO TRICK MOVES REQUIRED
The blade appears to have penetrated your arm
BLOOD SQUIRTS OUT ALL OVER
Chrome Steel Blade.
Knife Through Arm Trick (watch video)