
I was done with Latin by fifth grade.
The Big Bang Theory Season 3, Episode 2

And so I'll say it
in Latin or Klingon
The Big Bang Theory Season 11, Episode 10

Interesting fact: "irritable"
comes from the Latin,
The Big Bang Theory Season 12, Episode 6

Something about Latin music...
The Big Bang Theory Season 6, Episode 1

(LATIN MUSIC PLAYS OVER SPEAKERS)
The Big Bang Theory Season 1, Episode 3