I begged my little brother to clean his filthy half of the room we shared. He did nothing. I yelled that I didn't want to live in a pigsty. This, too, had no effect. So I tried another tactic: commending him instead, loudly and extravagantly, each time he picked something up, like I was training a dog. "Harrison, thank you so much for picking up your socks!" I said. "This room looks amazing!"