A few years ago we were in Memphis, which has the one of the world's largest pyramids (who knew) which is a bass pro shops. Seriously. Anyway, there's a restaurant at the top and an observation platform. It's all glass, too.
So we're eating at the restaurant and the kids and I decide to walk onto the observation platform, so we weave through tables and walk toward the open glass door. My 8 year old son and I walk directly toward the door, but my 11 year old DD sort of veers off from us and walks directly into the glass. I mean directly, bonked right off it, with enough noise that diners stop eating and look at us. I lose it completely. We hustle outside and I'm laughing so hard I'm crying and bending over holding my knees. She's mortified but we're all laughing. We still laugh about it years later.
As we were leaving the platform, we stopped and looked at the glass window she bonked into and could see smears where her face and knee just banged right into it.