this reminds me of a similar joke
3 guys fall in a jungle and the cannibals capture them. they take them to the village that was next to an abandoned airport and they tell them "you will spend the night in the golden plane one at a time. if one of you resists the temptation to steal he can go free, if we find any gold pieces from the plane on you we will kill you"
after the 1st night, they take the 1st guy and search him. after a thorough search, they find a few golden screws on him and kill him
the next day the search the 2nd guy and they find that he was trying to sneak out with some golden cables so they kill him too
the 3rd day, as much as they tried they could not find anything on the 3rd guy so they told him he can go free because he was honest.
the guys asks "what did the other 2 steal?"
the cannibals respond "some screws and some cables"
and he says "ah, this why the engines didn't turn on"