
If I give the right command in German,
she'll rip your face off.
The Big Bang Theory Season 6, Episode 21

meaning German.
The Big Bang Theory Season 12, Episode 7

Quartz, from the
German "quarz"
The Big Bang Theory Season 12, Episode 2

But I'm from the German school. Berlin's.
Money Heist Season 3, Episode 5

Like reenacting the ancient German practice
of trial by combat.
The Big Bang Theory Season 8, Episode 19