TV series example of the word

The Big Bang Theory Season 11, Episode 12
You'd either have to break your hip or let Howard knock you up.
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The Big Bang Theory Season 1, Episode 4
<font color="#E86CE4">(KNOCK ON DOOR)</font>
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The Big Bang Theory Season 4, Episode 7
<font color="#E86CE4">(KNOCK ON DOOR)</font>

Breaking Bad Season 4, Episode 4
This is very important. Did you knock or ring?

The Big Bang Theory Season 10, Episode 4
I didn't knock, but it's fine. I didn't knock, but it's fine.