I don't mind the birthdate, but they better not be asking about my weight!
A pretty common sentiment.
asked people's weight religiously and if I thought they weren't telling the truth, I made them step on a bathroom scale
Now THAT must have been fun to watch ... I can hear it now:
"Welcome aboard, ma'am. Can I ask you how much you weigh? It's to calculate the aircraft weight."
"Errrr, 125 pounds."
"Okay, ma'am. Hmmmm, would you step over here on this scale, please?"
<<Sound of high-velocity hard-sided purse fracturing a pilot's skull>>
"STEP ON THIS, A*****E!"
I wouldn't do that without a kevlar helmet, bullet-proof vest, and a catcher's cup!