Like reenacting the ancient German practice
of trial by combat.
The Big Bang Theory Season 8, Episode 19
(SINGING IN GERMAN)
The Big Bang Theory Season 10, Episode 20
Quartz, from the
German "quarz"
The Big Bang Theory Season 12, Episode 2
meaning German.
The Big Bang Theory Season 12, Episode 7
You know,
the German philosopher,
The Big Bang Theory Season 5, Episode 7