Didn't break anything, but I sure embarrassed myself when I was a kid.
I grew up in Edmonton, and one year when we went to Klondike Days, my family and cousins all went together. One of the attractions back then was the "Hall of Mirrors", where the main part is a maze compiled of plexiglass and mirrors where you work your way through to get to the upper level where the curved mirrors are to make yourself appear twisted up, tall, whatever. When we came back down, we had the task of finding our way back out through the plexiglass maze. Anyway, in our efforts, and my desire to be the first one out, I called to everyone I was with that I found the exit, and quickly made a bee-line to it. I soon discovered when they let everyone in, they put up a plexiglass wall to seal everyone in. Looks an awful lot like an exit. I was pretty much top speed for a 12 year old, and ran head long into the glass. I'm not sure how many people saw it, but I can tell you everyone heard it.
Nothing broken. Except for my ego of course.