Yep, it’s a Breaking Bad cocktail. Embrace the kitsch at several locations of the U.K.’s London Cocktail Club, which offers a glowing (and actually legal) version of Walter White’s potent brew. A take on the Margarita, it’s an icy blend of tequila, lime, agave and something called “blue falernum,” which we have a feeling is spiced falernum zinged up with blue food coloring. (The London Cocktail Club didn’t respond to our queries, but a rep at Astor Wines & Spirits says, “a lot of tiki enthusiasts make their own [falernum].” Something we, as serious tiki enthusiasts, can vouch for—check out Supercall's recipe. “They probably made a version with blue coloring.”) Regardless of where you stand on artificial additives, the Heisenberg, which comes in a large beaker with a baggie of blue salt, is undeniably fun.