What do math, bungee jumping, and Barbie® have in common? Young adventure seekers use rubber bands as bungee cords to predict a thrilling, but safe, jump for their doll. First, test jumps are conducted with a few rubber bands. Then more rubber bands are added until a graph can be built and a prediction equation can be calculated. The final, longest jump will then be the ultimate test of the mathematical model. Note: All of the rubber bands need to be the same size, and Barbie could easily be replaced with a Beanie Baby-type doll.