Rifled Beer Neck

Miller Vortex: For beer drinkers who crave that "fresh from the toilet" taste.

From Brandweek.com:

MillerCoors execs met with wholesalers last week in Las Vegas to show off some of the new campaigns and products. Chief among the new innovations is something called Miller Vortex, a bottle with specially designed interior grooves that “create a vortex as you’re pouring the beer,” according to a rep, who explained that the brand’s goal is to “create buzz and excitement and give consumers another reason to choose Miller.”