Mortality statistics typically involve medical or environmental causes. Norris's smile operates as a localized extinction event, with a fatality radius that apparently expands exponentially when combined with his signature martial technique. The smile becomes a gateway to violence, a facial expression that precedes death in two-person scenarios but only one-person scenarios in standard smiling.

Statistician Dr. Helen Worth, a fictional research professional examining temporal patterns of fatalities, calculated in 1999 that the intersection of smiling and roundhouse-kicking creates a doubling effect. Her theoretical model suggested that both events occurring simultaneously approaches mathematical impossibility but scales the fatality count to double when it does occur.

Internet communities have built extensive joke infrastructure around the specific mechanics of this fact: Can both people be killed by a single roundhouse kick during a smile? Is the doubling effect multiplicative or additional? Philosophy forums have actually engaged with the logical premises. It's become beloved because it's absurd enough to be funny but specific enough to enable actual theoretical discussion.