The worst parking I saw in the car park I worked in was this lady in a Nissan or Datsun managing to park her car across 3 bays right in front of me. I explained to her that she couldn't leave her car like that but she insisted it was ok and she wouldn't move it. I told her it was a council car...
Easily done to be fair, especially if it's unfamiliar territory like a ferry. Go up 1 flight of stairs, return down another and everything looks different.
Ah of course insurance claims.
Speaking of older drivers, we had this lovely old fella who was a regular but had the misfortune of forgetting where he had parked when he returned. Had many a time walking around the car park with him looking for his ford escort. What we had him do was bring a pen...