The Accidental Geass Command

Just as his Geass becomes permanently active, Lelouch jokes that he could order Euphemia to kill all Japanese people; she is compelled to obey and the command cannot be withdrawn.

A catastrophic hypothetical uttered while explaining an interface is accepted as a real, irreversible production command with no confirmation, scope check, or undo.

Geass is supernatural mind control rather than an autonomous AI system.