I took 4 years of German in high school. Super rusty, but getting back into it is on my to do list.

I don't have three languages to pick for RagnaToad's question, mainly because I only plan on being trilingual. English, obviously. German I chose to learn because I do have German ancestry and I wanted to preserve a tiny bit of my heritage that the rest of my family has long forgotten. And my third language will be Italian, because why not? Ok, so Assassin's Creed may have influenced me a little...actually, it made me very much interested in Italy in general. And it may not be in my blood specifically, but there is some Italian in my family these days.

If I really really felt like it after reacquiring German and learning Italian, I would go for either Latin or Japanese. Learning Latin would actually make it easier to learn multiple other languages, but I'm interested in it mostly from the standpoint of...it's Latin, what other reason do you need? Japanese because of the whole gaming/anime thing. I actually watched so many episodes of Naruto (subbed) once that I started thinking in Japanese despite not "knowing" the meaning of the words...it was an interesting experience, to say the least. Actually it taught me what fluency really is, and got me interested in picking up my language studies where I left off.