You have twenty cows. While being shipped across the ocean, they discover the secret of immortality. That very night, one of the cows contracts mad cow disease and starts eating the rest. Then he gets thrown in the ocean.
You have two thieving cows. They run into a bunch of bad assed gangster cows and get wasted on an elixer of immortality. 1000 years later, the first two cows realize what happened and rejoice in the streets dressed like hippies.