Sticks and stonesSticks and cornerstones won’t break their bones, but they just might break their spirit. A dozen workers at a small international marketing company recently found themselves at a retreat run by experts from an "experiential learning" firm. "They came in talking about the seven cornerstones of teamwork," says one attendee, so each employee was given a pouch filled with seven colored stones that stood for concepts like sharing resources, defining roles, and communicating frequently. Whenever a participant violated a cornerstone during the exercise, others had to roll a stone at him across the table. "Not communicating? Here's a purple stone," says the attendee mockingly. "It was ridiculous. We've worked together better since that silly offsite, but it's probably because we sat around the bar afterward laughing."