The Simpsons
S8E14: The Itchy & Scratchy & Poochie Show
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or coughing or talking softly.
Now, you each have a knob in front of you.
When you like what you see, turn the knob to the right.
When you don't like what you see, turn it left.
My knob tastes funny.
Please refrain from tasting the knob.