See what makes Grimace tick in this awesome anatomical rendering of McDonald's one and only purple shake-loving monster. Dreamed up by artist Glen Brogan, Shirt Woot elaborates on his many health troubles, probably related to a lifetime of lousy dietary choices: "G weighs over 540 pounds. He is only 25, but suffers from hypertension, Type II Diabetes, elevated cholesterol, gallstones, Gout, sleep apnea, and has recently suffered a mild heart attack." {via A Hamburger Today. Thanks, Richard!}