We had a new extention built onto our school and all new classrooms got new furniture. Now the chairs were not the best and if one leaned backwards the 2 back legs would bend at the welded joint. You could bend them back into place just once and had to be careful not to break them off completely. Of cource there was one of these chairs in the classroom and we had a teacher who was strict but who usually leaned backwards on his chair. Chairs swopped. As he leaned back the legs broke and he was left sitting on the floor with just his head above the table. He turned beetroot red and the whole class just erupted but nobody said a thing. I still laugh about it!