its in the bible,and it means more than just throwing the first thing you can get your hands on. its something to do with being insulted.And there has been many a shoe thrown in anger. the most famous was when George w Bush dodged a shoe,but i remember reading somewhere a shoe that was thrown at some guy in the middle east was buried.yes the shoe that was chucked was buried,it became a famous shoe.if this lock down continues it might be a good idea to stockpile on shoes.