
How do you meet girls playing the CELLO?
The Big Bang Theory Season 6, Episode 18

Leonard, you'll play your CELLO.
The Big Bang Theory Season 2, Episode 12

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

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