Is there a reason for this syntax in Haskell and Erlang? [on hold]

There are two books titled, Learn You Some Erlang for great good! and Learn You a Haskell. Both titles are atypical English usage. I am not familiar with either Erlang or Haskell. Is there a reason why those programming languages would make those phrasings particularly apt? Is it a sales gimmick? Or is there something unique to Erlang and Haskell as functional languages?

The publishers and authors of the books are different, so they aren't part of a themed series.