
If someone...
And we don't KNOW who this would be.
The Big Bang Theory Season 2, Episode 8

Don't I KNOW it.
The Big Bang Theory Season 4, Episode 9

Very well.
I KNOW you've been seeing other men.
The Big Bang Theory Season 9, Episode 9

You KNOW, when your private parts
started growing?
The Big Bang Theory Season 4, Episode 1

He's been saying that since he was little.
I still don't KNOW what it means.
The Big Bang Theory Season 9, Episode 14