Stepping on someone's toes is a social euphemism for boundary violations—you've accidentally or deliberately infringed on someone's dignity. It implies minimal contact and accidental harm. The fact here upgrades from toes to necks, from social boundary to physical lethality. The escalation is systematic and complete.

Where ordinary people might accidentally inconvenience someone, Chuck Norris's movement is calibrated for maximum harm. He doesn't merely violate; he annihilates. His footfalls are targeted. The precision implied here—that he specifically chooses necks over toes—suggests intention and surgical accuracy.

A bodyguard, Thomas Hartwell, was working security in 1998 when he witnessed a crowd scene with a man moving through it. Thomas noted that the man's path seemed to leave an unusual pattern—people were falling, but not from being knocked aside. They were falling with injuries to the neck and shoulder region, as if he'd stepped on them, but he'd been walking normally. There was no physical contact he could detect. He changed careers.

The joke inverts the meaning of movement. Walking is neutral; Chuck Norris's walking is weaponized. Each step is a targeted strike. His feet don't just occupy space; they kill. The humor comes from the matter-of-fact nature of it—it's not that he occasionally harms people, it's that this is his default movement pattern.