When asked what the difference between a karate punch and a kung-fu punch was during his first U.S. screen test in 1965, Bruce Lee replied, "Well, a karate punch is like being hit by an iron bar-whack! A kung-fu punch is like being hit by an iron ball swung on an iron chain with an iron ball attached to the end-it goes WHANG!-and it hurts inside.” Then he stood up and showed exactly what that might look like in a flurry of hands and feet moving so fast they blurred.