Fly fishing is an angling method which my grandfather taught me. Its quite a good technique. 
Oh neat, I've always found that interesting. Where are fly fish located? We mainly have bass where i'm from
It just refers to casting using a fly rod, reel, and specialized weighted line.
Hmmm gotcha. Well what's a fun fact about it?
Well, casting a nearly weightless fly or "lure" requires immense precision. Not a fun fact, but still interesting.
No that definitely counts! I wasn't aware the lure was so leight. That must be difficult
It is! Fly fishermen use hand tied flies which are even more complicated