i'd go for master every musical instrument, i always had a tunes that fit perfect in my head for certain moment around me but can't figure what keys or notes as i imagine.
while my only motivation to learn other languages are the curse words which just simply by google it, youtube it on why is it said that way, it's reasons, and which situation. after that, free to use it fluently to any idiots on the road or to simply not to hurt their feeling while blatantly cursing them... in front of them (or your boss... you're welcome).
if they ask what's that mean, is up to you how do you wanna play it, lol.