I know a guy whose life's goal is to learn to recognise every single spoken language and then learn how to say 'Sorry, I don't speak ......' perfectly in them all. It would be awesome...
As a fan of language cul-de-sacs, the languages I know (apart from English) are Welsh, Finnish and Italian (and by know I mean: can buy something in a shop, order a round of drinks, swear like a trooper and understand enough to know when I'm being insulted during conversation). As a Brit it does make me seriously mortified when I meet so many Europeans who are fluent in 3, 4, 5 languages. I'd love to do it, but the effort involved...