There are many reasons to learn German. One is so that you can sound like you’re saying something mean when you’re really paying someone a compliment. Another is so you can use words like Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz.
But I think the single greatest thing about understanding German is being able to watch all the awesome airplane related documentaries they seem to have over there, like this one that I randomly stumbled across on YouTube last night, about a Condor 757-300 flying from Germany to Greece:
Or this one, about someone training to become a pilot in Germany:
There are tons of other great ones out there, but these are two I just came across yesterday.