Unintended consequences

I love this.

[ London Mayor Boris Johnson on deciding to wear a helmet:] As I cycled around, I felt a surge of bonneted righteousness. I was socialised; I was showing a proper sense of community, and that is why I turned around on my doorstep, and within another three seconds I would have gone back to get my helmet, and I would have fastened the chinstrap of social obedience … except that for some reason I didn't. After weeks of helmeted conformity, I had a spasm of rebellion - and it is hard to say exactly why.

[On the other hand...] I have also brooded on the results of some study in Australia, which showed that making bike helmets compulsory deterred so many people from cycling that there was a rise in obesity - and more people ended up dying of heart attacks than were saved by the head-gear.