[humblegunner]

Three knocks is pretty close to no-knocks.

But not quite the same.

[Lazamataz]

"Three knocks is pretty close to no-knocks."

But not quite the same.

He should have knocked three times on the ceiling if he wanted her.

Twice on the pipes, if the answer is no.

Oh my sweetness.

(tink tink tink) Means he'll meet her in the hallway.

Twice on the pipe (tink tink) means he ain't gonna show.