So the ass measuring Ass-ist-ant joke did not work. I'll try another, below. No, I'm not sexist or blondist if there's such a thing it's one of my blond sister's "Blond Jokes"
A blond bimbo was flying New York to London and sat in first class with an economy ticket. The stewardess not getting her to move told the captain who said: "Leave it to me". He whispered in her ear and she quietly got up and went back to her economy seat. Stewardess to captain "That was incredible what did you say". Captain: "Just told her first class was not going to London".