My daughter was in competitive dance for several years, which meant that we traveled a couple times a year to competitions.
My wife, as most moms did, handled 99% of everything related to dance. I just showed up and clapped.
On the road, the dancers from our team, of which there were over 100, generally waited together in a room until it was their turn to perform. That waiting room was NOT the changing room where they changed costumes between dances, so it wasn't uncommon for parents to be in that room.
Apparently that room arrangement was not always the case. Sometimes the room was for changing AND waiting. This was something I didn't know.
So, there was one local event that my wife couldn't attend. She dropped our daughter off with her hair and make-up done, costumes in hand and left. Apparently she forgot some part of one of her costumes, so she frantically called me to stop by our house to get that missing item and bring it to her before the competition started.
I get the missing item, walk onto the campus and, after wandering around for a few minutes, trying to find where our team was, I ask someone who pointed me in the right direction. I find the room, open the door and just stroll in like I belong there. For reasons that should be obvious, I yell "Oh God!!", spun around, eyes covered, ran into the door jamb and felt my back outside.