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
This contest was publicity stunt to promote THE HOUSE OF DARK SHADOWS in 1970. No subsequent contests have ever been held since.
The creators of Dark Shadows considered launching a similar "Miss Ghost America" contest to promote the next film, Night of Dark Shadows.
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