These are my experiences of the wonder of disabled parking bays!
My parents are both disabled and when I was in my early 20's I was at the supermarket with them. They had parked in the disabled bays and after putting all the shopping in the car, I (being fairly healthy at that time) returned the trolley to the supermarket. When walking back to the car, I was almost run over by a man trying to park in the disabled space next to them before anyone else got it. His bumper actually banged into my knee, and when he got out of the car, no apology, in fact he began shouting at me for crossing