My mother ans father spoke different languages and where i grew up the language was different so i picked up 3 since childhood. My wife's native language is a different one, which i learnt recently so that's 4, and we have english obviously so 5. I can also understand a few words in languages from...

Mostly early Internet, videos about maths on YouTube. If you couldn't understand foreign language at least shallowly back then, you would miss many good niches like Everybody Edits, Flash games which had programming capabilities in their level editors. You would just be stuck in autistic circle of o...