All this talk of understeer and oversteer, etc... recently reminded me of
something that was happening to me last year while driving on icy roads.
The rear end of the van seemed to want to pull to the right everytime I
tried to accelarate.  I let off the throttle everytime it did this, but it
felt like the van would have gone around in a circle if I kept pushing.
Has this happened to anybody else?  If so any idea of what causes it?

Dave