scheme - A large-scale systematic plan or arrangement for attaining some particular object or putting a particular idea into effect, often through deceptive means
It's better to be honest and work hard, and not spend too much time devising or falling for schemes that are tempting shortcuts to making money.
muzzle - A device, usually an arrangement of straps or wires, placed over an animal's mouth to prevent the animal from biting, eating, etc.

In addition to a strait jacket, Hannibal Lecter was forced to wear a muzzle so he wouldn't eat people.