Can the ceilings of any of your meeting rooms be raised?
I didn't hear about this until the next day, but it should have been a tip-off that trouble lay ahead. However, she was told there was an available room, and she would need to fill out our online reservation form to reserve it.
That night the woman came in with her group, which is when I got involved. It turns out she never did actually reserve a room, but just showed up expecting one. All our rooms were in use by then, so after much scrambling around trying to find an available space, I ended up dividing our large meeting room with the movable wall - then I went back downstairs to the Reference Desk feeling satisfied about accommodating a patron's request.
About ten minutes later, the Children's Librarian came down to see me. Our Children's Room is right next to the meeting room, so she can often hear what's going on in there, even at moderate noise levels. I thought she was going to commiserate about our online room booking system or not having enough meeting space to meet community demand, but instead she asked:
Did you tell that group they could use a catapult?
Ha. Apparently, this group was a school group, and for a science project they built and are experimenting with a catapult. It wasn't quiet as large as the one in the picture, but still it was too big, too loud, and too dangerous for us to let them use it in the library. I'm actually a little bit in awe of them for apparently thinking it would be perfectly okay.
Now, you know I like medieval siege weapons, but perhaps this is a good rule of thumb: if the library's ceiling is too low to do something, then that is something you cannot do in the library.