So they go out to the poles with ladders and tape measures,
and they're falling off the ladders, dropping the tape measures - the
whole thing is just a mess.

An engineer comes along and sees what they're trying to do,
walks over, pulls the pole out of the ground, lays it flat, measures it
from end to end, gives the measurement to one of the blondes and walks
away.

After the engineer has gone, one blonde turns to another and
laughs.  "Isn't that just like an engineer, we're looking for the height and
he gives us the length."