Risking that I may sound like some sort of pervert, but I've never taken a camera with me whenever I went to a car exhibition or racing meet (and I wouldn't even waste a thought on doing so only because I'm going to a different country for the holidays)...
I think there is some truth to the old native american belief that taking a pic of an object might capture it's soul, which would be a pretty rude thing to do to all objects that you honor very much. Well, not really, but that excuse definitely sounds better than "I'm always too lazy to take pics", doesn't it?
