THE LEPRECHAUN

You look Vincent straight in the eye and tell him you don't believe in Leprechauns.

Vincent seems to broaden his grin at this and says "OK that's fine with me, I don't believe in myself either and I don't believe in pots of gold, rainbows or talking animals but most importantly I hate those jokes that go, 'How many Leprechauns does it take to change a lightbulb' Ha, Ha!"

Ask how someone manages not to believe in themselves. (Literally)

Ask him about his brother.
Ask him where his pot of gold is.
Tell him he's just like a pigmy but with funny shoes.
Ask him if he has a girlfriend!

You can move to:

The Waterfall, The Avoca Motte Stone