Now here's a twist on the blonde joke:

Two Irish guys were standing at the base of a flagpole, looking up.
A blonde walked by and asked what they were doing.
Paddy says: "We're supposed to find the height of this flagpole, but we don't have a ladder."
The blonde took a wrench from her handbag, loosened a few bolts and laid the flagpole down. She then pulled a tape measure from her bag, took a few measurements and announced that the pole was eighteen feet and six inches. She then walked off.

Paddy's mate, Mick, says "Ain't that just like a blonde!! We need the height and she gives us the length."