I've google translated a language so much that I can now read and write it without a translator or dictionary.
I met a group of lads from Quebec on OSRS and they invited me to their discord server about a year ago, and now I can effortlessly type in French and (for the most part) tell if what I've written is grammatically correct.
I can also mostly understand what they're saying, but my accent sucks when speaking. I think this is pretty neat considering I never once touched anything like duolingo, "inpoot", youtube tutorials, or anything of the sort.