Why do we say riding shotgun?

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Why do we say riding shotgun?
“average author writes 3 books a year” factoid actually just statistical error. average author writes 0 books per year. Brandon Sanderson, who lives in Utah and writes over 10,000 words each day, is an outlier
A public service announcement
There’s a production of Rocky horror where Gilbert Gotfried is The Criminologist.
A good friend once shared this factoid that "all mammals take roughly 20 seconds to urinate" and every time I am taking an extra long piss it comes hurtling through the brain fuzz to annoy me.
Morning piss time should not be interrupted with such nonsense!
Nevermind that I may have procrastinated peeing so long that I am now evacuating several gallons at once...
lesbians can do many things
Thing Howard, Todd Howard's brother and a man of incredible strength, was the lead "Brute Force Power" consultant during Skyrim's development.