My favorite trick was one I managed to teach a Dobie/Weim mix I babysat for a few weeks. She had this wonderful long tail and I kept thinking, "We've got to do something with that tail." She was brilliant and easy to teach, and she helped me come up with the trick. I would hold out my "gun" hand and yell "BANG!" She would collapse dramatically, wagging wildly, and roll over onto her back and stick all four feet straight up. Still wagging. I would say, "Are you dead?" and she would just wag harder. Then I'd tell her, "Dead dogs don't wag!" and she would stop instantly. My favorite trick ever!