The automobile - pronounce it out loud, you'll say it something like "ow-toe moh-beel", i.e. in a German accent. Because Germans invented cars.
The assault rifle. They invented the concept, a handful of prototypes without the relevant doctrine (or for the 1890s one, even a detachable magazine) is irrelevant. Fight me, @bluewing.
The Berlin Wall, putting beach towels on recliners at the crack of dawn, sauerkraut, lederhosen, frankfurters, doner kebabs, hamburgers, donuts, cheese, iron gates, macerated cherries, aardvarks, the car, the bicycle, diesel, the moon, beer, lager, tamagotchi, the letter 'a', the number 25, serrated saw blades, cantilever bridges, ice cream, hand lotion, galoshes, the ipod, bilateral symmetry, the dawn, goths, the parachute, that sizzling noise meat makes when you fry it, hats, gloves, left socks, altitudes over 1,773 feet, postmodernism, and geese.
The US Army. Given the history, you might expect it to based on either the French or British model, but no, they mostly took notes from Prussia.
You might also think it's a very top-down authoritarian model for a military, but also no. That notion mostly comes from the legacy of Nazis. Both before and after, the German model of the Army is one of the least top-down authoritarian militaries.
Rigid (as in using a solid frame to keep shape instead of gas pressure) airships? Unless there's an earlier example of that than the ones Zeppelin made that I'm not thinking of