Joke

Once there were two people in the desert.

One carried a telephone booth on his back, the other a large rock.

A certain moment they met eachother.

Hi, says the one with the rock, why are you carrying a telephone boot?
Well, says the other, if I encounter a wild beast, I put it down and I go inside of it. Then I am safe!
Oh!, the one with the rock says.
Why are you carrying a rock, says the other?
Well, he says, if I encounter a wild beast, I drop the rock..

...then I can run twice as fast ! !