Which McDonald's menu item inspired the name of the character Uncle O'Grimacey?

The Shamrock Shake inspired the name of McDonald's character Uncle O'Grimacey.

Uncle O'Grimacey was introduced as the uncle of Grimace and was used in promotions for the seasonal green, mint-flavored Shamrock Shake. His name and appearance reinforced the drink's association with St. Patrick's Day and the color green.

The Shamrock Shake originated at McDonald's in 1970, although its availability and exact distribution have varied over the decades. Uncle O'Grimacey belonged to the character-driven period when McDonald's used fictional figures to give individual menu items their own identities.

The character is sometimes confused with Grimace himself because both names use the same “grimace” wordplay. Grimace became a broader McDonald's mascot, while Uncle O'Grimacey had a narrower promotional role connected to the Shamrock Shake. That distinction makes the menu association the key branding fact.