You know what, I think you've just hit the nail on the head. I started thinking about it and I noticed the following :
Ice Skating - Always go Anticlockwise (left)
Skiiing - Always Stop by hard turning left
Karting/Powerslide - Always prefer left hand down.
Intresting as I'd never thought about it before - maybe some sort of lower instinct.
As I said, all this means to me is that I'll have to put a lot more miles on the bike to try to counter that!
Cheers,
JC