
I didn't want you ending up
with a bad GRADE and get discouraged...
The Big Bang Theory Season 6, Episode 6

In the first GRADE, my friend Rosie and I
made a pact to marry Bert and Ernie.
The Big Bang Theory Season 3, Episode 5

Yep, I had to go through
the entire second GRADE...
The Big Bang Theory Season 1, Episode 15

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