A young man with a promotional stall in Clapham Junction station forecourt asked me this morning if I was interested in paintballing. I asked him what had given him the impression that I might be and he said because it was so much fun. Frankly I can think of few things that would be less fun than being hit in the head by an exploding paintball. So what is the point of it, do you think? Has anyone done it? Is anyone thinking of doing it?