Monica Mcklinski/WireImage

As some holiday travelers were dutifully stripping off their socks and ditching their $5 water bottles at security, at least one passenger was—shall we say—a little less concerned with TSA regulations.

Specifically, Flaming Lips' lead singer Wayne Coyne brought a grenade on board a plane in his carry-on luggage and caused complete travel mayhem. Let us repeat: He packed a grenade in a carry-on.

Turns out the weapon wasn't live, according to the police report, but the threat concerned authorities enough to shut down a terminal at Oklahoma City's Will Rogers World Airport while they scrambled to make heads or tails of the situation and keep the crowd safe.

Remember the feud between the Flaming Lips and Erykah Badu?

Check out other celebrity airport screening drama