You should not put food down on the couch.
Mickey and Sarah are on the couch, watching TV, and have a few pieces of leftover pizza from dinner, when Sarah leaves to go to the bathroom.
Mickey wants to do something with the leftover pizza.
Mickey takes the pizza to the kitchen and puts it in the refrigerator.
Mickey puts the pizza on the couch cushion next to him.
Sarah eats the leftover pizza the next day for lunch.
Sarah sits on the pizza when she returns from the bathroom and ruins her pants.