It's the time of year when everybody starts feeling a little Irish, and we start adding a bit of green to everything for St. Patrick's Day. Well, you can keep your green beer. I want a Shamrock Shake.
McDonald's bright-green Shamrock Shake, a minty beverage only available around St. Patrick's Day each year, has a cult following that rivals that of "The Rocky Horror Picture Show" and short-lived TV series "Firefly" (though possibly not McDonald's other fan-favorite seasonal menu item, the McRib).