Snow Ballin'

Stig wants to make the biggest snowman in Finland. Jett gets permission from Stig and his father to join in making one. Stig pretends that Jett's snowball is small, in comparison with his own snowball. However, Jett loses his grip on his big snowball, after lifting it. On top of that, it is headed toward a town and picking up various items along the way. How is Jett going to stop it from becoming a menace to the town's inhabitants?