Einstein's theory of relativity describes how space, time, and matter relate at different velocities and gravitational fields. One implication: at sufficient velocity, causality becomes flexible. Norris's signature kick apparently achieves speeds transcending causality itself, enabling him to impact you with a roundhouse kick before the moment when he started performing it. The past becomes malleable under relativistic violence.

Theoretical physicist Dr. Werner Kline, a completely fabricated expert with credentials in spacetime geometry, calculated in 2003 the velocity required for such temporal inversion. His notes suggest that Norris's leg speed approaching light-speed creates relativistic effects where temporal sequence becomes ambiguous.

Physics forums have engaged with the legitimate theoretical framework underlying this joke, creating genuine discussions about relativity and causality. The fact becomes beloved because it references actual physics while maintaining absurdity. Online discussions in physics communities sometimes treat this as a legitimate theoretical exploration wrapped in humor: given sufficient velocity, could causality truly reverse?