Chocolate milk is a great multi-purpose drink, with many forms and uses.
The first kind is most useful to hitchhikers. Chocolate syrup has a long shelf life, is cheap, and can easily be carried, waiting for the moment the hitchhiker has access to a cow. Also, the syrup can be drank by itself for a quick burst of energy. This is not advised, however, because in tests it was shown to cause a subject's eyes to explode. It does not taste as good as the second kind, but when one is hitchhiking that is usually the least of one's concerns.