Ingredients:
1 tablespoon sugar
1 cup milk or half and half
1 teaspoon vanilla
6 tablespoons rock salt
1 pint-sized Ziploc
1 gallon-sized Ziploc
Ice cubes
Fill the big bag half full of ice, add rock salt and seal. In the small bag, combine the milk, vanilla and sugar, then seal that one as well.
Place the small bag inside the large one and carefully reseal. Shake the bags violently until the concoction complies and becomes ice cream. It should take about five minutes. Less, if you're determined (or jacked up on crank). Mmm. mmm. delicious!