Medusa, from Greek mythology, possessed a gaze so lethal that anyone who looked upon her face turned to stone. Chuck Norris's 'O face'—the expression of exertion or pleasure—allegedly produces an identical petrification effect. The comparison elevates Chuck to mythological status while simultaneously equating his aesthetic expressions with a curse. Most people attempt to make attractive or at least neutral expressions during vulnerable moments; Chuck's O face is so terrifyingly intense that it functions as a weapon. Those unwise enough to witness it don't merely see an unattractive expression—they experience permanent physical petrification.

Psychologist (fictional) Dr. Margaret Stevens documented accounts from individuals claiming to have glimpsed Chuck's O face during alleged encounters in 1998. She noted that survivors reported permanent psychological trauma rather than actual petrification, but the fear of petrification was so genuine that it manifested in psychosomatic symptoms indistinguishable from literal stone transformation. Stevens theorized that Chuck's O face possessed such powerful negative aesthetic properties that the mind's defense mechanisms essentially froze the observer in place through sheer terror.

The O face meme has become one of the most deployed jokes in Chuck Norris internet culture, suggesting that his every expression—even those intended to be vulnerable or intimate—projects lethal force. It's become shorthand for the idea that Chuck cannot make a non-threatening expression, that his physical presence is inherently dangerous regardless of intention or intention.