And really, driving in any condition is harder with the parking brake on.
We will say this about the following video: if there's a bunch of snow on the ground, it may not be immediately obvious that the reason your car won't move is because the parking brake is on. The two can produce very similar results, although we think that even the driver of the car in the video would agree that leaving the parking brake on is a pretty boneheaded thing to do. And this sort of thing has certainly happened on dry pavement as well.
It's still pretty funny to watch though, that can't be denied.