That's debatable. While it was once true, today's "I-demand-it-and-I-demand-it-now" culture has made sure that the old adage is stone cold dead. Trying to live by that motto now is impossible.
People come in, make demands, you meet the demands, they decide they wanted something different, demand you meet those demands and give them what you have already provided, "Since you screwed it up!" I've seen it happen many times over here with some of our customers. Now I know exactly why our customer service guy is leaving tomorrow. (Anybody interested in the posistion I can point you in the right direction to apply)
Even Wal-Mart has distanced themselves from that motto in many cases. A friend works the Customer Service desk at WallyWorld, and has told of girls bringing back used, yes USED, pregnacy tests to get their money back on them. or people buying a big bucket of chicked from the deli, eating most of it, and then coming back in and demanding their money back because it wasn't good (or wanting it replaced!)... if it was so bad, why did you eat 12 out of 15 pieces?!?!?!
The best is someone buying something and either trying to return an empty box, or putting something else in the box, both thinking they won't check it. My friend said a guy brought back a laptop, and when she opened the box it had a Leapfrog laptop in it instead of the Acer he had bought. Another guy bought a big screen TV and tried to return the empty box... she knew something was up when he come CARRYING IT IN by himself...