Been there, done that. But not a parking lot, a rural drive way (aka: bobsled track jeep trail).
Kind of icy, but I could see patches of gravel in it. I knew if I made it to the top, I could swing around to come back down. So, I hammered my little 500, and clawed my way almost to the top. Slid down a little until I hit some gravel, and I thought it would hold.
As I was walking up, I turned and saw my truck slowly sliding back down said jeep track. Nothing I could do, so I finished the delivery. Luckily, the berms on either side of the track kept it on the drive, and it slid across the road at the bottom and stopped in the empty yard of a pallet mill.
Far from my worst day, and I laughed my butt off after that one.