The Kiddie Stock Market

With the stock market in turmoil, go grab three cute school kids, give them each $100, and marry them up with a financial trader in your market.  Introduce the teams to the audience on a Monday.  Tell each team they must day trade for one week (they have to buy/sell at least one stock each day).  Check in with them daily.  Whatever money the kids have left the following Monday they get to keep for school clothes and supplies.