Gizmodo -
2 Aug 2013 23:00

Beer cans, once the vessels of crap beer only, have recently been embraced by craft brewers nationwide. It's a beer can renaissance! But despite the surge in popularity, beer cans aren't perfect. Invert the can too quickly and you're going to get a very uneven pour and a mouthful of air. But this simple hack, known as the Shark Fin, vents the beer can, resulting in a smooth, consistent pour from beginning to end. You might think of it as a gentleman's shotgun.
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