TIFU by pulling down my pants on the TSA line

Got all caught up with my mind somewhere else and all the hurried commotion of emptying pockets, removing coat, shoes, belt... aaand I continued to unbutton my pants, unzip and pull down down my pants to reveal my boxers to the surprise of everyone around. Quickly realized and pulled them back up as fast as I can but it was too late. What the hell was I thinking???