I used to work at a Sam's Club and you could always tell the first timers. They'd be standing out front with a dazed look on their face with a year's supply of toothbrushes and a vat of mayo in their cart.
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She says 'You don't know what brings a person to a book', and it's taken very seriously, almost like a priest or a doctor. A librarian would also likely die by torture before they'd divulge someone's reading history.