Leonard, you'll play your CELLO.
The Big Bang Theory Season 2, Episode 12
You mean my CELLO.
The Big Bang Theory Season 1, Episode 5
When I broke up with Penny,
I got back into my CELLO...
The Big Bang Theory Season 4, Episode 3
Are you cool
playing the CELLO?
The Big Bang Theory Season 7, Episode 6
How do you meet girls playing the CELLO?
The Big Bang Theory Season 6, Episode 18