Tricks of the trade
From a Tricks of the Trade article that has now spawned it’s own Tricks of the Trade website:
Piano Salesman: If you see a potential customer eyeing a piano, estimate their age and calculate what year it was when they were 18 years old. Play a big hit from that year on the piano they’re looking at. With a lot of preparation and a little luck, you might play the exact song they were listening to when they lost their virginity, got married, or drove their first car. The emotional resonance will overcome sales resistance and even open their wallets to a more expensive piano.
And with my computer background, I really liked this trick:
Technical Support: When helping someone fix their computer over the phone, and you want them to see if all the cables are plugged in correctly, don’t ask, “Have you checked to see if the cable is plugged in?” because the customer will always say, “Of course I did, do you think I’m a moron?” Instead say, “Remove the cable, blow the dust out of the connector, and plug it back in.” The customer will most likely reply, “Hey, it’s working now—I guess that dust really builds up in there!”