Tuna monster

Food that will smell bad as it rots (e. g. tuna fish) intentionally left hidden where it will bother and confuse someone.

“I threaten to nail my obnoxious neighbor with a tuna monster at least once a month.”

“I left a tuna monster for my former roommate- inside the curtain rods and down inside the holes in the floor where the old-school radiators used to be!”