S4·E37 The Minty Fresh History Of McDonald's Shamrock Shake

Saint Patrick’s Day was originally created to honor the death of Patrick, a fifth century Romano-British cleric who became the patron saint of Ireland.

Today, however, it’s most famous for being an excuse to binge drink… Shamrock Shakes from McDonald’s, that is. But how did this minty treat become an annual favorite? And why can’t we have it year-round?