Depends on the languages. Learning python and ruby, or Java and C# then not so much (it will just remind you of the Steve Martin quote "what is it with the fre

Depends on the languages. Learning python and ruby, or Java and C# then not so much (it will just remind you of the Steve Martin quote "what is it with the french it is like they have a different word for everything"). Learn Java and Haskell then learning one will make certain misfeatures in one obvious and provide a clean logical way to think about what is going on(anonymous inner classes vs higher order functions.)