Years ago we once had a brown Sierra which I parked near the entrance to our local Asda. I did my shopping, came out, found the car, unlocked it and got In, then realised the interior upholstery was a different colour! Yes, there was another brown Sierra parked bear mine, and my keysopened both! I beat a hasty retreat before the owner found me in their car ....
Another little 'lost it' story - I take part each year in a big biking ride-out for charity (Hogging the Bridge) which involves 4,000 - 6,000 bikes riding across the Severn Bridge. One year we were all sitting on our bikes ready to go, when another biker was spotted running frantically up and down the ranks, as he couldn't find his bike in amongst the other thousands! Tee-hee! I guess he had to wait till all the rest had gone to find it!
And yes, I have lost my silvery-grey car more than once in big retail park car parks ....
However there is a gizmo on the remote for it which switches the head lights on so that's one way of finding it.