Just sit down and start coding in Haskell. Not that Haskell is the world's best langauge or anything, but it strictly enforces a functional mode of thought, an

Just sit down and start coding in Haskell. Not that Haskell is the world's best langauge or anything, but it strictly enforces a functional mode of thought, and that's what you want if you want to be forced to program functionally.