You can't knock on opportunity's door and not be ready.
Bruno Mars
Occasionally the state of the planet can knock me off my perky perch.
Graham Norton
Knock the 't' off the 'can't'
George Reeves
Why do you knock yourself out? Take it easy.
David O. Selznick
Go to you bosom: Knock there, and ask your heart what it doth know.
William Shakespeare
I never know when somebody's going to knock on the door of my own unconscious in a way that I wouldn't have anticipated.
Anna Deavere Smith
I've got a right to knock down anybody holding a bat.
Early Wynn