Wayne Coyne of The Flaming Lips will be getting a letter from the Transportation Security Administration telling him how much his fine will be for carrying a disarmed hand grenade in his carry-on luggage at Will Rogers World Airport.

Coyne, of Oklahoma City, was on a trip to Los Angeles on Nov. 10 when a TSA agent spotted a hand-grenade in his bag at a security checkpoint.

The agent closed the checkpoint and began protocols for dealing with a live bomb. The TSA explosives expert was not on duty at the time but quickly arrived and determined the grenade, painted gold, had been deactivated and posed no threat. According to police reports, Coyne said the grenade, which had a hole in the bottom, was a gift given to him at a party in Arkansas.

The west security checkpoint was closed. While people in line behind Coyne missed flights during the one-hour security delay, most were rebooked and sent on their way.