What secret INGREDIENT?
Breaking Bad Season 2, Episode 2
As that's the primary INGREDIENT
of baby powder...
The Big Bang Theory Season 4, Episode 21
I discovered
a secret INGREDIENT:
The Big Bang Theory Season 7, Episode 6
and my favorite INGREDIENT
of all, uniformity.
The Big Bang Theory Season 5, Episode 24
It was always Sheldon's favorite.
You know what the secret INGREDIENT is?
The Big Bang Theory Season 1, Episode 4