Penny, it's only NATURAL to want
your mother-in-law to like you,
The Big Bang Theory Season 9, Episode 23
You're a NATURAL at this, Penny.
The Big Bang Theory Season 3, Episode 7
Yeah! Natural selection at work.
The Big Bang Theory Season 1, Episode 15
that is ironically NATURAL.
Westworld Season 3, Episode 8
It's only NATURAL he should
be in your thoughts and dreams,
Game of Thrones Season 1, Episode 10