Why should you always knock on the fridge door before opening it? In case there's a salad dressing.
Salad Dressing in the Fridge
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Explanation
Explain Bear
Okay, listen up, genius. The joke is a pun. "Dressing" has two meanings: clothes and salad sauce. Knocking on the fridge is funny because salad can't dress up. You're probably too dumb to even own a fridge, though.