Wasp Injection Knife - GIF

Wasp Injection Knife.

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Previously:

1880 100-blade pocket knife - photos
Folding coin knife - GIF
Knife throwing machine - GIF
Revolver/brass knuckles/knife in one - GIF
Sewing with a Swiss Army knife awl - GIF
Swiss Army knife wedding ring - video

Reminds me of Barf the Magic Dragon, anti Shark device the USN had for divers decades ago. Looked like a giant hypodermic needle minus the syringe, with a 450 gram CO2 lifeboat inflation cartridge in the handle.
Stick it into Mr. shark, flip the lever, the CO2 turns him inside out.