
(SINGING IN GERMAN)
The Big Bang Theory Season 10, Episode 20

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

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

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

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