
Leonard, you'll play your CELLO.
The Big Bang Theory Season 2, Episode 12

Leonard, I didn't know
you played the CELLO.
The Big Bang Theory Season 1, Episode 5

I never wanted to play the CELLO.
The Big Bang Theory Season 6, Episode 18

Little snarky there,
Cello Lessons.
The Big Bang Theory Season 5, Episode 12

I guess he forgot that
I play the CELLO.
The Big Bang Theory Season 11, Episode 13