This TED talk describes the marshmallow challenge exercise. This discussion has a nice twist to focus on team dynamics and the decision process. Interestingly, kindergarten students tend to do best on the exercise because they are more likely to iterate and prototype rather than separate planning and execution (as MBA students tend to do). Of course, this is similar to the Tinkertoy exercise but the team dynamics and decision-making message is quite distinct. You may also recognize this as a slightly altered version of the spaghetti challenge exercise that has been around for quite some time.