Mellow Mushroom offers two dozen beers on draft and bars on three floors, including the rooftop deck. (Photo by Bill O'Leary/The Washington Post)

Well, that headline got your attention, didn’t it?

Here’s the deal: Maryland’s Flying Dog Brewery and Delaware’s Old Dominion Brewery are participating in a most unusual popularity contest at Mellow Mushroom, beginning tonight at 6 p.m.

Each brewery is bringing a cask of its real ale to Adams Morgan. You pay $25 for all-you-can-drink beer from those two casks and all-you-can-eat pizza that lasts as long as the beer does. The brewery whose cask is finished first will be crowned the champion, though one can argue that the real winner is anyone who pays $25 to stuff themselves full of endless pizza and beer.

Buy tickets in advance or risk getting shut out.