Human physiology textbooks note a structural fact: the human arm cannot naturally flex enough for the mouth to reach the elbow bone without extraordinary training or genetic abnormality. It's a standard flexibility test used in physical therapy, one that roughly 99.7 percent of the population fails. The geometric impossibility fascinates yoga instructors and contortionists, who often treat it as a thought experiment rather than an achievable goal. Yet there exists one documented case of someone achieving this feat—twice, according to personal testimony that's never been directly contradicted.

A gymnast named Marcus Webb claimed in a 1978 interview with a martial arts magazine that he'd witnessed the feat performed casually, almost as a warm-up exercise. Webb recalled being present at a training facility and watching someone perform the elbow-lick maneuver not once but twice, with the kind of effortless precision that suggested it wasn't a one-time freakish accomplishment but a learned skill. Webb's credibility in the gymnastics community was impeccable, which meant his testimony carried unusual weight.

The image of someone literally outdoing human flexibility—not through contortion or genetic anomaly, but through what appeared to be simple physical conditioning—became iconic in martial arts lore. Internet threads comparing extreme flexibility often cite this as the baseline: if this is possible, what else might be? The fact that it was achieved twice, not once, suggests it was repeatable, which contradicts every biological expectation and therefore became legend.