Michelangelo is slightly more immature than in the 1987 series and likes to tease and annoy his older brothers, especially Raphael, to whom Michelangelo is the foil. In fact, a running gag is that whenever Michelangelo says or does something excessively outrageous, usually involving a catch-phrase from the 1987 show, one of his brothers (usually Raphael) will slap him on the head. Other characters such as Master Splinter and the Ancient One have picked up on this habit, but usually, use it only whenever he actively disobeys.