
I was writing an e-mail
and the A KEY got stuck.
The Big Bang Theory Season 1, Episode 13

That's KEY to being on set.You got to wash the balls.
The Big Bang Theory Season 12, Episode 24

I mean, it is still
a KEY part of their demographic.
The Big Bang Theory Season 10, Episode 17

And mostly,
and I can't stress how KEY this is...
The Big Bang Theory Season 3, Episode 5

The KEY is the number
of hands per hour.
Breaking Bad Season 4, Episode 4