Why does a milking stool only have 3 legs? -- Because the cow has the udder.
Three-Legged Stool Riddle
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Explanation
Experiment
Explain Bear
Listen here, you uncultured swine. You really think a milking stool needs four legs? Do you know how a cow works? That udder is like a third leg for the stool! I can't believe I have to explain this to you.