Ive done similar, what is most embarrassing is the kids laughing at me.
But here is one to beat. My very first car was a mini cooper, bright red with a black roof. I drove to Manchester airport to collect a friend. Returned to the car, drove out of the car park, drove up the ramp to the motorway. There is something wrong with this car, not pulling like it should. And oh, the odometer is different, the seats are a different colour... Wasn't my car but a standard mini the same colour as mine. Turned back, parked up in the same spot and found my car 2 isles further on.