If you're interested in making
a SINCERE effort to be a good teacher...
The Big Bang Theory Season 8, Episode 2
And I want you to know that
that is SINCERE. I do feel bad.
The Big Bang Theory Season 9, Episode 13
Did you make the apology
as SINCERE as I would have?
The Big Bang Theory Season 9, Episode 23
A, that was not a joke,
that was a SINCERE request.
The Big Bang Theory Season 6, Episode 24
Not to "Sin City" but to "SINCERE city."
The Big Bang Theory Season 9, Episode 13