One of the most abstract fields in math finds application in the 'real' world

[Lucky Luciano]

1. I have FAR too much experience with category theory.

Too many commuting diagrams! Though, that is really the beauty of it. It is like meta-math. Then people go too far and talk about the category of categories with the functoes being the morphisms between categories.

I promptly sold out to the highest bidder and learned to program and do applied math. A pure math person needs to take an oath of poverty.