That's KEY to being on set.You got to wash the balls.
The Big Bang Theory Season 12, Episode 24
The KEY is the number
of hands per hour.
Breaking Bad Season 4, Episode 4
You have the only KEY.
Westworld Season 3, Episode 8
Sansa is the KEY to the North? I seem to
remember she has an older brother.
Game of Thrones Season 3, Episode 5
It looks like an immensely
complex encryption KEY.
Westworld Season 2, Episode 5