From another forum:
So two engineers are standing staring at a flagpole.
A blonde walks up and asks what they are doing. One of the engineers answers we’re supposed to measure the height of the pole but we don’t have a ladder.
The blonde notices a pin at the base of the pole, pulls it out which allows her to lower the pole. She takes out a tape measure and says ‘it’s 6.5m’ and walks away.
One of the engineers turns to the other and says, rolling his eyes, ‘typical blonde, we’re supposed to measure the height not the width’!