Penny started taking a CLASS.
She wrote a paper.
The Big Bang Theory Season 6, Episode 6
our unassigned
armor CLASS units.
The Big Bang Theory Season 11, Episode 16
He said I'd be
speaking to a CLASS.
The Big Bang Theory Season 7, Episode 7
Ooh, I have CLASS.
The Big Bang Theory Season 12, Episode 2
You mock the sphincter,
but the sphincter is a CLASS of muscle...
The Big Bang Theory Season 4, Episode 2