Moxie.

The Wikipedia entry for Moxie suggests that one can approximate this nauseating soft drink by adding bitters to root beer. Having not tried this approximation, but having tried the original beverage during at least two youthful jaunts New England way, I can make another suggestion:

Take a can of supermarket brand cola. Add an old cigarette butt sans paper and filter. Blend until the carbonation has evaporated. Drink, carefully and near a bucket of some sort. Then wonder why it is that New Englanders have a reputation for being brighter than other Americans.