...ever to be stuffed
into his own CELLO case.
The Big Bang Theory Season 4, Episode 18
This one birthday,
I came home from my CELLO lesson...
The Big Bang Theory Season 1, Episode 16
Leonard, you'll play your CELLO.
The Big Bang Theory Season 2, Episode 12
...building computers
or practicing your CELLO...
The Big Bang Theory Season 8, Episode 22
Little snarky there,
Cello Lessons.
The Big Bang Theory Season 5, Episode 12