The Grim Adventures of Billy & Mandy: Fred Loves Frozen Yogurt
Science → Neuroscience → Sphenopalatine Ganglioneuralgia
Grim, Mandy, Billy, and Fred Fredburger get frozen yogurt from a local store. After Fred has trouble deciding what flavor to get, Grim, out of frustration, tells the server to get him both chocolate and mint. Fred and Billy each eat their ice cream with both joy and pain, as they get brain freezes from their treat.