You shouldn't leave a mess for others to clean up.
Patrick finishes eating at his friend Bob's house and wipes his mouth with a paper towel.
Patrick wants to get the dirty paper towel out of his hand.
Patrick gets up and throws the paper towel in the kitchen garbage can.
Patrick lobs the paper towel onto the dinner plate, where it bounces and rolls to the middle of the table.
Bob is happy to see his friend help him keep the kitchen clean.
Bob is disgusted by Patrick's careless disregard for his kitchen and feels let down.