Well, art aside, I used to hustle in Backgammon when I was in late teens/early 20's. 

See when I was in grade 12 we were learning the probabiity of gene traits and I applied that to dice rolls and figured out the probability of the dice rolls. I memorized them and used it to my advantage after a few games of so-so playing. 

Was it a con? Some might think so, but we played for quarters, so I don't really count it :) 

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi