Thread title is petty self-explanatory. I'll go first, even though I wasn't the one who was unclothed . . . when I was an undergraduate a few years ago, there was a guy who I would see in the the hallway of an academic building every Wednesday afternoon wearing nothing but gym shorts. It turned out he was a model for a photography class that met in the building, and that it was just easier for him to go to shirtless than it was to go to the building and change. He had the body to pull it off, but it was definitely bold on his part.