For example, Lisa Peterson hasn't talked
to me since 11th GRADE.
The Big Bang Theory Season 4, Episode 7
but I spent most of fifth GRADE
with my head in a toilet.
The Big Bang Theory Season 7, Episode 2
I was only being polite.
Pemberton is a GRADE A weasel.
The Big Bang Theory Season 12, Episode 21
Mrs. Wunch in fourth GRADE.
The Big Bang Theory Season 9, Episode 23
Oh, hey, in seventh GRADE,
The Big Bang Theory Season 11, Episode 13