That's not necessarily true. If I was born on a Friday and died on a Friday, I lived most of my life on a Friday. A shade over 1/7th of my life was on a Friday while the rest of the days got a shade under, depending on how long I lived.
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You don't get it, do you.
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I don't care if its a reference to a show. I'm proving the basic principle of the joke inaccurate.