Keep Your Boarding Pass Out!
At the Pre-check line at FLL this morning, the doc checker is scribbling something on boarding passes and the dragon manning the metal detector is screaming at people "Keep your boarding pass OUT as you come to the metal detector! If your boarding pass is on your phone, tell me."
Not wanting to take any chances, I put my scribbled on boarding pass in my pocket and told her I had a mobile boarding pass. She waved me through without even asking to look at it.
Security theater at its finest.