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Starting tomorrow, the special spuds come out at Shake Shack when the annual "When Irish Fries Are Smiling" return to the scene for St. Patrick's Day. Much like a baked potato, the burger slinger's beloved crinkle cuts get all loaded with horseradish cream, scallions and bacon and will be available Friday through March 17 for $4.50. In anticipation of a sloppy, green beer-and-Guinness-drenched Tuesday, the Burger Days Crew will be conducting a series of well-regulated experiments this weekend to determine if these new fries do, in fact, soak up alcohol better than the regular ones. Or maybe we'll just eat a bunch of fries and drink a lot. Shake Shack | 1216 18th Street NW | 800 F Street NW | 50 Massachusetts Avenue NE | DC | 7924U Tysons Corner Center | McLean | shakeshack.com