Why might you choose to learn German? Well, maybe you're going to be visiting your German relatives, and you want to impress Oma with your mastery of "Please pass the mineral water!" Or perhaps you're going to be an au pair in Vienna. It could be that you need to read heavy German texts for your dissertation, or pass a language competency exam.
But it could also be that once you discover that the German for sloth is Faultier ("lazy animal"), skunk is Stinktier (if you guessed "stinky animal," you're catching on), and turkey is Truthahn ("threatening chicken"), you find yourself too enchanted NOT to learn more.
...in which case, you're in for a treat. Wait till you find out how to say "lightbulb."