I was asked by a gentleman if it was so cold outside when your up in the air why weren't there ice blocks groowing on the wings!
And the other all time classic " Where are we now?"
Now I know the correct thing to do is to call the flight deck and ask what country we are passing over below but after 14 years of this you just can't resist telling them " on a 747 35000 feet in the air!" and walking away.