|"We're still missing something. Oh yeah—Wario!"|
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Jack the Knife is an enemy in Wario: Master of Disguise. He is a knife that attacks by rotating, aiming at an angle of Wario, and charging forward.
- His name is a pun on jackknife which is a type of knife.
- According to his game description, He is formed from the rage from a lifetime's worth of butter spreading and chicken slicing.