Penny started taking a CLASS.
She wrote a paper.
The Big Bang Theory Season 6, Episode 6
I signed us up for ballroom dance CLASS.
The Big Bang Theory Season 10, Episode 23
You know the new Discovery CLASS missions
NASA's been working on?
The Big Bang Theory Season 8, Episode 21
Since when do you go
to spin CLASS?
The Big Bang Theory Season 7, Episode 20
Just so I know,
would you be open to taking his CLASS?
The Big Bang Theory Season 2, Episode 7