Being partial to cats myself, I love this piece on a journalist who discovers that - gasp! - not only can you clicker train a cat, but it can open new doors never before imagined:
At one outdoor concert, a 10-year-old boy with Down's syndrome walked by. He was enthralled by the piano-playing feline. He stared at Ricky for several minutes, then spontaneously began to laugh. We're not talking little giggles here. I mean full-blown belly laughter. His mother was stunned. She told me quietly, "Billy's father passed on two weeks ago. Everyone tried to get him to talk, to react, but he wouldn't."