When you think about it, screaming is an integral part of going to a fairground, as is being blasted with heavy-on-the-bass music and going home with a goldfish. Located on the very commons that once played host to their medieval equivalents, for a few days the tranquil green of grass is replaced by day-glo, neon and the shine of well-used metal. The petrol fumes of the generators, the queues and the smell of reheated burger fat are the trade-off for the most fun you'll have on a bank holiday. But then, even if you want to avoid these, you can always go to a theme park: the sanitised version. That's not to say that theme parks are in any way a lesser experience. Absolutely not...