I guess he forgot that
I play the CELLO.
The Big Bang Theory Season 11, Episode 13
...building computers
or practicing your CELLO...
The Big Bang Theory Season 8, Episode 22
Leonard, I didn't know
you played the CELLO.
The Big Bang Theory Season 1, Episode 5
Are you cool
playing the CELLO?
The Big Bang Theory Season 7, Episode 6
clearly you've never
seen me play the CELLO.
The Big Bang Theory Season 7, Episode 6