
...and I could smell German chocolate cake,
which is my favorite.
The Big Bang Theory Season 1, Episode 16

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

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

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

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