An Act of Vengeance: To leave a pile of one's own or anothers feces in the middle of a room conspicuously. Upon entrance, the room's owner cleans the said pile. Weeks later, after cleaning and re-cleaning the original spot the owner finds the second pile, inconspicuously placed elsewhere in the room.

The Decoy is a powerful tool and should only be used when true vengeance is sought.

Also colloquially referred to as "the jimmy leg" "THE s.b.d." "the intractable salami" "the Prince of Darkness" or "The hidden menace"