One makes the city's densest frozen treat; the other, one of the city's fluffiest. So what would an offspring of Shake Shack and Big Gay Ice Cream look like? No need to make any guesses as the pair are debuting a limited-edition scoop-milkshake hybrid this weekend. The "Layer Shake" ($6.50) is a 16 ounce ice concrete/soft-serve mashup that'll be on offer at Big Gay's West Village shop and Shake Shack's DUMBO outpost on Friday through Sunday.

At Big Gay, that means a layer of egg nog soft-serve topped with a layer of graham cracker crumble with caramelized pumpkin seeds and cranberries made by La Newyorkina. On top of that, a Shake Shack shake made with a pumpkin frozen custard. In DUMBO, the ice creams are reversed.

Now that the burger shop has partnered with Cronuts and Salty Pimps, who'll be the next big dessert collaborator? We're pulling for a Barnburner.