Ancient American custom.
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My favorite aunt was a hair stylist when I was a boy, and she would frequently favor me with a large handful of the coins she received as tips. I've been conditioned to think well of tipping :)
Not exactly - tipping didn’t get into vogue until just after the Civil War. At a time during the Depression there were signs in some establishments that stated: “No Tipping. Keep Your Change” - my feelings are if someone has a classy restaurant that makes big bucks, drive their Beemers, they can jolly well pay their waitstaff a decent wage. Why expect the public to make up what the employers won’t pay? Just saying.