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

What's German for "annoying"?
The Big Bang Theory Season 12, Episode 7

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

Unless they're German,
The Big Bang Theory Season 7, Episode 12

Now, in German.
The Big Bang Theory Season 10, Episode 20