In our dorm lounge we have an air hockey table. The only puck we have for it is pretty chipped and nasty by now, though, because there are too many beefy dudes who like to play air hockey. The result is that the puck jumps off the table easily and flies around near face level, so we've started calling it "Death Hockey". My thumbnail was partially destroyed a few nights ago, and there are a lot of dents in the walls.
Enter Patrick. Patrick is a skilled machinist. He saw the problem, and today he went to the machine shop on campus and made a solution from an extra bit of 0.25" aluminum. It's heavy, shiny, loud, and terrifying... And it'll still fly around if you hit it hard enough. Death Hockey just got even MORE deathy