He hasn't gone away, you know - after becoming an Internet legend, Uncle O'Grimacey is returning for McDonald's Shamrock ...

Grimace and his vibrant green uncle, Uncle O’Grimacey. McDonald’s has also launched exclusive Uncle O’Grimacey swag, with a portion of each sale going toward Ronald McDonald House Charities.

Enjoy a Shamrock Shake: For every Shamrock Shake purchased from Feb. 10 to Mar. 23 at participating McDonald's, 25 cents will ...

McDonald's fans, it's time to celebrate! Grimace is back and is bringing the Shamrock Shake along with him this season.

Together, Grimace and Uncle O’Grimacey are supporting Ronald McDonald House Charities (RMHC) and their mission to keep ...