I have taken five milligrams of heroin through the toes for pain, amphetamines for energy, and cocaine, because I am partial to cocaine. I've come here to walk you down the aisle.
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So many weird old religious rules started out as trying to keep unenlightened but highly religious groups alive, fed, and disease-free, and somehow we've hung onto so much of it. For another example, check out the origin of sacred cows.