This Teenage Mutant Ninja Turtles t-shirt shows Leonardo, Michelangelo, Donatello and Raphael ready for action. The shirt includes the turtles' catchphrase, "Cowabunga". Cowabunga is a catchphrase first used by the Ninja Turtles in the classic 1987animated series. While used by all four turtles, its generally associated with Michelangelo. The phrase became so popular that Michelangelo performed a song named "Cowabunga" during the Ninja Turtles' Coming Out of Their Shells tour in 1990. For any fan of the heroes in a half shell, this Cowabunga Teenage Mutant Ninja Turtles T-Shirt is a must have. Fun fact: Teenage Mutant Ninja Turtles co-creator Peter Laird has said that the phrase "Cowabunga" was inspired by a peanuts comic that showed Snoopy surfing.