Best "lost car" cockup of all time.
Told to me by a mate some years ago.
He and some friends had decided to go to the British Grand Prix at Silverstone. Their cunning plan was to arrive early to beat the traffic and then leave as soon as the cars crossed the line to beat the traffic out.
On arrival they were directed to overflow parking in a field. They carefully triangulated the car's position in the field from surrounding trees and such, on the (entirely correct) assumption that it would be a sea of cars when they returned. When the race finished they hared out to get the car.
Problem: Which of the forty or so fields now full of cars in the surrounding countryside was the one in which they had triangulated their car's position? Solution: Wait 'til everyone else has gone, the correct field is the one with a car still in it.
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Another one that made me laugh was one of the suits who went out on the lash while away on business in ${European_Capital). He got rather legless and took a taxi back to his hotel. The next day he went back to retrieve his Merc, to find it wasn't there. Police report, return to base, order new car and new laptop.
A few days later he got a call from the police in ${European_Capital}, saying they'd found his car, undamaged, with all his belongings still in it. It was almost 100 meters from where he'd had it stolen from, or "exactly where he'd left it before getting trolleyed and forgetting about it" as we like to think of it.