Snowballs and Toilet Paper
Snowballs, when made - get larger and larger. When you first start rolling it's small. As you go, it gets bigger and bigger. Try rolling a snowball uphill, you can't. You roll it down the hill, and sometimes you can't keep it from going. You might stand in front of the snowball so it doesn't get out of hand, or get help. When the snowball gets going, it really does get going
