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Sick son: "Why do we need to wipe with a cotton ball before the injection?" "Wipe your butt to get it drunk first, then it won't hurt when you get the shot." Son: "But it still hurts!" "That's because your butt can hold its liquor!"

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(Note: The last part seems to be a product advertisement for a crusher machine and may not have a direct translation as it contains specific product and company information.)