Get ready for Shamrock Shake season at McDonald's! The Shamrock Shake is a delicious milkshake with minty green syrup, whipped topping, and vanilla ice cream. It will be back on the menu starting February 10th. You can also try the Oreo Shamrock McFlurry, which has Oreo cookie pieces mixed in. When you buy a Shamrock Shake, McDonald's will donate 25 cents to Ronald McDonald House Charities until March 23rd. This year, Uncle O'Grimacey is making a return after many years away. He is Grimace's Irish uncle, and he first appeared in 1975. Uncle O'Grimacey is all green with a shamrock-adorned vest and a little hat. In a commercial, Grimace gives him a Shamrock Shake as a gift. Uncle O'Grimacey will be featured on limited-edition merchandise like t-shirts and hats, which you can buy on the McDonald's website. A medium Shamrock Shake has 540 calories, while the Oreo Shamrock McFlurry has 460 calories. These are yummy treats to enjoy, but remember to eat them in moderation. If you're curious about the calories in other McDonald's shakes, a medium vanilla shake has 570 calories, and a medium chocolate shake has 650 calories. If you're excited about Shamrock Shakes and Uncle O'Grimacey's comeback, you can show your support by buying the special merchandise and enjoying these tasty treats at McDonald's. Don't forget that part of the proceeds will go to help families at Ronald McDonald House Charities. It's a tasty way to give back and enjoy a fun St. Patrick's Day treat!