Skoorb,
It must be a Canadian thing

I do it all the time...and as far as dry spots go...I guess people haven't seen the types of storms we get up here (i.e. snow flurry that turns to freezing rain that turns parking lots into ice rinks).
My friend's the craziest though. He races even on dry pavement and really wrecks his car. One time he started doing donuts in reverse around a lamp post of a parking lot at 40km/h (didn't think reverse would let you go that fast!). He's really precise though...about the only guy I trust to drive me like that.
All that practice pays off though. I've been able to pull a skid, and gain control and avoid an accident on the highway because of this parking lot practice. My friend (same guy mentioned) once had some idiot slam on the breaks in the middle of the 401 as my friend was being tail-gated from behind. With not much to lose, my friend skidded and practically did an outline of the car by going onto the unpaved shoulder, then regaining control and driving normally without causing any disturbances to the traffic around him...of course, the idiot caused a major disturbance as the guy that was tail-gating my friend couldn't really stop in time and ended up cutting off a guy in another lane who had to slam on his breaks, and well you get the picture...
-GL