
When I broke up with Penny,
I got back into my CELLO...
The Big Bang Theory Season 4, Episode 3

clearly you've never
seen me play the CELLO.
The Big Bang Theory Season 7, Episode 6

Leonard, I didn't know
you played the CELLO.
The Big Bang Theory Season 1, Episode 5

This one birthday,
I came home from my CELLO lesson...
The Big Bang Theory Season 1, Episode 16

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