Jack the Knife

Jack the Knives are enemies encountered in the game Wario: Master of Disguise. They are formed after all their rage of butter-spreading and other jobs knives do. They are bigger versions of knives (however not too big, about the size of Wario) and have eyes. They jump out of tables of the S.S. Caviar and try to attack Wario.

In-game Description
''These dull and rusted knives are fueled by their own rage over a lifetime of butter-spreading and chicken kiev-slicing. Rusted and dull, they know neither remorse nor pity.''

Trivia

 * Their name is a pun of "jackknife," a type of knife, and the song Mack the Knife.