Whenever someone finds out I have a licence, I usually get told:
"Really? That makes you Captain ******" Ha ha ha ha
(I share the surname of a famous captain)
No-one ever had problems believing me though.
A few months ago I went to the cinema with a friend. As we handed our tickets over to be checked, the girl said "Ooh, are you the one that flies microlights?". I explained that although the aircraft I fly are small, they're classed as aeroplanes. She seemed even more impressed with this. I still have no idea how she knew!