I sense that's not SINCERE,
although I have no idea why.
The Big Bang Theory Season 3, Episode 11
Not to "Sin City" but to "SINCERE city."
The Big Bang Theory Season 9, Episode 13
A, that was not a joke,
that was a SINCERE request.
The Big Bang Theory Season 6, Episode 24
Did you make the apology
as SINCERE as I would have?
The Big Bang Theory Season 9, Episode 23
...and if I can figure out a way to do so
and sound SINCERE, I will.
The Big Bang Theory Season 4, Episode 9