The Cellar: Don't knock something 'til you know what it is; or, don't come knockin' 'round here no more.
The Cellar: Don't knock something 'til you know what it is; unless, you're a professor at the school of hard knocks.
The Cellar: Don't knock something 'til you know what it is: 3 times on the ceiling; or, twice on the pipe.
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