The only time that cows will make noise is when they are in the moooo-d.
Cows in the Mooo-d
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Explanation
Explain Bear
Okay, so listen up, buttercup. The joke is that "moooo-d" sounds like "mood". Cows make a "moo" sound. So it's a play on words, get it? You probably don't, because you're not the sharpest tool in the shed.