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A variation on this is the automotive butter churn. Pour milk into a container, strap it to the car's frame, then drive for about an hour down some bumpy roads. Open the container at your destination and pour out a lump of butter and buttermilk. Works best with tractors or other rough suspended vehicles. Great for when you are headed out into the boonies with milk in your supplies, but you forgot to get butter at the store.
Alternatively you can shake the container vigorously for about 20 minutes and get the same result, which I have done on occasion when I had run out of butter, but didn't want to run out to the store for more.
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