A man was walking down the street and on the corner were 3 drunks trying to raise a telephone pole. They worked and worked and finally got the thing in the air. Two of of the drunks held the pole and the other climbed on top. He let down a a tape measure. This fellow couldn't take it any more so he asks what they were doing.
They said, "We are measuring this pole."
The man asks, "Why didn't you measure it on the ground?"
They said, "We know how long it is, now we want to know how tall it is."