There's a reason the red carpet is called a step and repeat. Once a celebrity steps onto the carpet, they then must stop, pose, and repeat over and over again until they've made it through the photographer gauntlet. The infernal process can give rise to moments of complete exasperation and "I've had it" gestures. It's only natural. The flashing lights alone could drive a person mad.
Johnny Depp Lights His Career On Fire By Joking About Assassinating The President