Sneaky tricks used in different professions. Some examples:

Photographer

When taking family portraits that include a dog, don't use the dog's name or say "doggie, doggie" to get its attention, because it might trot over to you. Instead, call out "kitty, kitty, kitty." The dog will perk up and look around for a cat, and you can get a great shot if you time it right.

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.

(Via Boing Boing.)