"Dear passengers... please belt up."
So your flight attendant has a face like a burglar's dog? Surly, stressed and acting like a Nazi, bossing you about the plane? Maybe they're in the wrong job - perhaps they'd be happier as a cabbie or a wrestler. Maybe there's just received an unexpectedly high gas bill.
Or maybe there's another reason, as this open letter from an anonymous flight attendant will attest to.