From an account involving the conversation between airport security and some soldiers returning from Afghanistan who were boarding a chartered flight:
So we're in line, going through one at a time. One of our Soldiers had his Gerber multi-tool. TSA confiscated it. Kind of ridiculous, but it gets better. A few minutes later, a guy empties his pockets and has a pair of nail clippers. Nail clippers. TSA informs the Soldier that they're going to confiscate his nail clippers. The conversation went something like this:
TSA Guy: You can't take those on the plane.
Soldier: What? I've had them since we left country.
TSA Guy: You're not suppose to have them.
TSA Guy: They can be used as a weapon.
Soldier: [touches butt stock of the rifle] But this actually is a weapon. And I'm allowed to take it on.
TSA Guy: Yeah but you can't use it to take over the plane. You don't have bullets.
Soldier: And I can take over the plane with nail clippers?
TSA Guy: [awkward silence]