Little snarky there,
Cello Lessons.
The Big Bang Theory Season 5, Episode 12
...ever to be stuffed
into his own CELLO case.
The Big Bang Theory Season 4, Episode 18
You mean my CELLO.
The Big Bang Theory Season 1, Episode 5
I never wanted to play the CELLO.
The Big Bang Theory Season 6, Episode 18
This one birthday,
I came home from my CELLO lesson...
The Big Bang Theory Season 1, Episode 16