Of all the things you want to pack on your carry-on, this is NOT one of them. TSA officials at Mitchell Airport in Milwaukee discovered what the passenger called "a sculpture" in his carry-on bag. Here was the message on their Instagram account:
“Call me crazy, but this contraption seems to be “locked” in on its target. This piece of art is prohibited due to the fact that it’s built around a grenade. While it is an inert grenade, we don’t know grenades are inert until our explosives professionals take a closer look, and that takes time and slows down the line. It can even lead to a complete shutdown and evacuation. Why aren’t they allowed you might ask? Good question. Would you like to see somebody pull a grenade out of their bag at 30,000 feet? This was discovered in a carry-on bag at Milwaukee (MKE).”
A reminder (and I don't believe I have to type this): If it looks like an explosive or weapon, you can't bring it on a plane. C'mon man!