Actually I did sit in a chair that was already about to break and it collapsed as I sat down. (I was not fat at the time either). I was fucking humiliated, and it wasn't even my fault. It was just a shitty old chair that should have been thrown out long before. If I felt that embarrassed about sitting on an already broken chair, I can't imagine how I'd feel if my fat ass literally broke a perfectly good chair. Although, a guy I used to work with regularly broke chairs (he was probably 450 or so) and he had zero shame about it.