Little snarky there,
Cello Lessons.
The Big Bang Theory Season 5, Episode 12
Leonard, you'll play your CELLO.
The Big Bang Theory Season 2, Episode 12
I guess he forgot that
I play the CELLO.
The Big Bang Theory Season 11, Episode 13
...ever to be stuffed
into his own CELLO case.
The Big Bang Theory Season 4, Episode 18
Leonard, I didn't know
you played the CELLO.
The Big Bang Theory Season 1, Episode 5