Reminds me of the old story about the blonde who was on a long drive from Las Vegas through the desert to Los Angeles in her VW Beetle, when with a splutter and a pop the engine stopped.
Not quite knowing what to do she thought she'd have a look at the engine just to make sure it wasn't smoking or anything, so went round the front to open the bonnet (hood..) and was mortified to see that it just wasn't there.
As luck would have it another blonde drove past in her Beetle, so of course stopped to see if she could help another lady in distress.
"I don't know what to do", cried Blonde No. 1, "The engine stopped, so I got out to have a look and it seems to have just dropped out somewhere back down the road!"
"Oh, don't worry about that" said Blonde No.2, going round to the back of her car. "Look", she says, "I've got a spare one here you can have!"