Mark Frauenfelder at Dinosaurs and Robots cut his thumb on his "shaving razor"1 at the airport.
I don't ever want to cut my finger on the razor again, so I put a binder clip over the blade. Since I am a firm believer in resistentialism (the theory that inanimate objects demonstrate hostile behavior towards us), it gives me great pleasure to imagine my razor crying out in pain from being pinched by the binder clip. It's a just punishment, wouldn't you agree?
1 A shaving razor? Or a handy way to travel with a blade in your carry-on?