Fascinating article that lists a bunch of tricks used in different types of work.
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.
Nurse: Patients will occasionally pretend to be unconscious. A surefire way to find them out is to pick up their hand, hold it above their face, and let go. If they smack themselves, they're most likely unconscious; if not, they're faking.
Link (Via Gadgetopia)
