McDonald's is leaning on customers' nostalgia for its McDonaldland characters to spur sales of its Shamrock Shake. The company said Tuesday that Grimace will reunite with his Iris

Uncle O’Grimacey, the Irish uncle of fuzzy purple fan favorite Grimace, is making his return to the Ronald McDonald universe. The character, who speaks in about the most stereotypical Irish accent you could possibly imagine, has been absent since the mid-1980s after debuting in 1975, returning occasionally to paint Ronald’s whole world green.