[citation][nom]xoloki[/nom]@symetrixpc: though the TSA has certainly been guilty of following nonsense procedures, the incident you described was actually completely valid from a security point of view.A mach3 razor blade cannot be used to bring down a plane; it won't break through the reinforced door to the cockpit, and everyone on the plane will restrain you if you try. On the other hand, several items containing more than 3oz of liquid could definitely blow a hole in the fuselage, if they contained high explosives.[/citation]
Ignorance is bliss. There are 3 (count them, THREE) razor blades in a Mach 3 razor. If broken, the razor blades can be removed. Now, let's think about what you can do with a sharp object like a razor blade. Cut someone? Hold someone hostage? Threaten to cut their throat? Now you've got a flight attendant hostage, and are ordering the Captain to do what you want before you hurt someone.
So, razor blades have no reason to be on an airplane.