For a limited time: Shamrock Shakes! 331 Rachel Simpson 03/17/10 11:04AM Filed to: St. Patrick's Day St. Patrick's Day McDonalds Milkshakes TV Video On March 17th, McDonald's shakes go green and McDonald's patrons go crazy for minty Shamrock Shakes. What follows is an expose on the excitement! Also, participating locations. [via YouTube]