Well, we actually use quite a bit of dry ice at work for, wait for it, keeping things cold...
Apart from the obvious "oh damnation, it's stuck to my hand" and "I feel like I'm suffocating, oh I am suffocating" problems with it, it's great. Not really a goer for Le Mans though, because as BigH said, where would we get it, and I'm not going to try to sneak a bootful of the stuff out of work and onto an overnight ferry! I can see me trying to start my car and finding that my petrol's frozen and I have a colony of emporere penguins living on the back seat of the Celica. So, I think it may be a combination of a bucket of salty iced water, the Stella bar, and the often over-looked "where's the nearest CA flag - I'll scrounge a cold one over there" method.
See you here. I'll be the one with my hands covered in freezer burns...