Well, while I was waiting in the supermarket queue this afternoon, a five-year-old was swinging on the separation barriers between the lanes. There was quite a hollow thud as his head hit the floor, and I coudn't help thinking that would put him off parallel bars for life.
Just think, if he'd been in school, a valuable lesson would have been missed.
Fair play to him though; he didn't whinge much and seemed to get over it fairly quickly. The woman next to me didn't seem to see the funny side at all.