I was a high school teacher who took a large group of students to a museum and it also had a balcony. I warned my students before entering of the RULES. I did not include spitting and yes I had one boy spit from the second floor. He hit a janitor. We did get kicked out. I was mortified.
I played for President Reagan as part of my high school band when he was in town for a speech. Part of that included a trip to the venue which was next to the shopping mall. One of my fellow students brought a can of fart gas at the spencer’s gifts. It got confiscated by my band director before we hit the secret service with the metal detectors!