The wave started with Blockbuster, back in September. The almost-defunct video store’s swan song had nothing to do with movies, but rather beer: The last standing location collaborated with its Bend, OR, neighbor 10 Barrel Brewing on a black ale appropriately named The Last Blockbuster. Less than two weeks later, Dunkin’ Donuts released a coffee porter with fellow Massachusetts favorite, Harpoon Brewery. It was IHOP’s turn next: The chain followed up the great IHOb debacle with IHOPS, a pumpkin pancake stout made with Keegan Ales. Then, in late October, Planters and Noon Whistle Brewing unveiled their IPA-Nut IPA. Four beers, in two short months, from four companies that all have one thing in common: They do not make beer. So, why the sudden rush to release these craft brew collaborations?