Ha!

Actually, I personally got a backpack through TSA that contained two live .50 rounds. It was accidental (a friend helped me tear down a theatre set and left his screw-guns at the theatre in a back-pack, and I ended up borrowing the back-pack for carry-on stuff on a trip to DC). I got it through San Diego, Minneapolis, Reagan and then got caught when I tried to re-enter Reagan after I left the terminal to meet the rental-car guy who was returning my personal car keys I left in the rental. On the fourth trip through security with the back-pack, the line stops, and the guy calls some other guys over to his machine, and the supervisor comes over and asks me if the back-pack is mine. When I said it was, he nodded at the airport cops, and two linebacker-looking cops come over and open the back-pack. I'm standing there rolling my eyes and saying, "This is ridiculous. There's no ammo in there." That's when the dude opens a little zipper pouch in the back-pack and pulls out the two biggest rounds of ammo I've ever seen. Of course, there are bigger rounds out there, but when you've been standing there denying being in possession of explosives with three TSA and two big cops who looked like Black versions of The Terminator are staring at you, the .50 cal rounds looked like 30mm API.

They let me go when I pointed out that I had literally just come through the same line 10 minutes before. The supervisor had me point out the TSA people who'd previously screened me...

Being honest, that WAS kind of a Barney Fife moment...