
did this as our science fair
projects in ninth GRADE.
The Big Bang Theory Season 11, Episode 13

but I spent most of fifth GRADE
with my head in a toilet.
The Big Bang Theory Season 7, Episode 2

I tried in seventh GRADE.
I could never get used to them.
The Big Bang Theory Season 4, Episode 18

Before that, I was in college,
and before that I was in the fifth GRADE.
The Big Bang Theory Season 1, Episode 4

I was only being polite.
Pemberton is a GRADE A weasel.
The Big Bang Theory Season 12, Episode 21