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

Are you cool
playing the CELLO?
The Big Bang Theory Season 7, Episode 6

...building computers
or practicing your CELLO...
The Big Bang Theory Season 8, Episode 22

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