It was ironic that Patty and Susan both wore the same dress to the party. In a group of ten people, it would be ironic to find two people with the same birthday. I think you will actually find that...
In many ways, such as dying. You could drown at a lifeguard party.
Or in science: Hydrogen and oxygen are the most flammable elements on earth, yet when combined to make H2O or water they can douse...