Samuel Adams Triple Bock, though it is an "extreme beer" having 17.5% alcohol! and is more like a port wine and can not be sold in the states of Alabama, Arkansas, Florida, Georgia, Idaho, Iowa, Missouri, New Hampshire, North Carolina, Ohio, Oregon, South Carolina why buy beer here. , Washington, and West Virginia.
A nice second choice, easier to find, with 7.5% alcohol, would be Guiness EXTRA Stout
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Update: Sam Adams Utopias MMII
It is in fact 24% alcohol by volume, making it the strongest commercial beer in the world.
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Truly the epitome of brewing's two thousand year evolution, Samuel Adams Utopias® offers a flavor not just unlike any other beer but unlike any other beverage in the world. Its warm, sweet flavor is richly highlighted with hints of vanilla, oak and caramel. With an alcohol content of 27% by volume, its complexity and sweet, malty flavor is reminiscent of a deep, rich vintage Port, fine Cognac or aged sherry while being surprisingly light on the palate. And like the world's finest after-dinner drinks, Samuel Adams Utopias is not carbonated and should be served at room temperature.
The End of History has an alcohol content of about 55%. I believe this is the highest.
http://www.msnbc.msn.com/id/38376048/ns/us_news-weird_news/
Bud Select: 3.1 carbs, 4.2% alcohol. Busch Light and Miller Lite are close to that too