I'm sure of things I know, and I don't pretend to be sure of things I don't.

So how can so many people be so sure of something they DON'T know?

Does that make sense?
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She was standin' alone over by the juke box, like she'd something to sell.
I said "baby, what's the goin' price?" She told me to go to hell.

Bon Scott - Shot Down in Flames