The Gas Cap Replacement
I have a friend who after filling his car with petrol, payin and driving off, realized he'd left the gas cap on top of his car. He stopped and looked and, sure enough, it was gone.
Well, he thought for a second and realized that other people must have done the same thing, and with that in mind decided it was worth going back to look by the side of the road in hope of finding his own or at least someone elses that may fit.
After only a short time of searching, he found a gas cap. He carefully wiped it off and carfully slipped it into place with a satisfying click, "Wonderful, it fits perfectly" he proclaimed to himself.
On his return home he proudfully retold the story to his wife, he finished with the decleration "I may have lost my gas cap, but I found another one that fits and it's a better cap than the one I had - IT LOCKS..."