There is this classic trick. Five paper cups are on the table or a board, the magician does not know under which a nail is hidden. He starts smashing the cups with his bare hand. In the end only the "dangerous" cup is not smashed.
Instead of a nail or a knife that is hidden under one of five paper cups, take an iphone.
It seems that nowadays the danger of smashing an iphone outweighs the danger of having your hand turned into a bloody mess. Especially with the young generation.