Once I had some roommates who would steal my food from the refrigerator. Several years after I moved out a friend recommended making cat food lasagna as revenge

Once I had some roommates who would steal my food from the refrigerator. Several years after I moved out a friend recommended making cat food lasagna as revenge as it wouldn't harm the perps, just be somewhat gross. (Note that I don't recommend this. I am just saying that if catching the perps with food is a goal then there are better options.)