You're a NATURAL at this, Penny.
The Big Bang Theory Season 3, Episode 7
It's NATURAL to be
a little cranky when you have...
The Big Bang Theory Season 5, Episode 12
And you're quite certain
he died of a NATURAL illness?
Game of Thrones Season 1, Episode 4
Doing it NATURAL instead.
Breaking Bad Season 2, Episode 12
Sweetie, this is a NATURAL thing to feel.
The Big Bang Theory Season 6, Episode 24