The Running of the Bulls in Pamplona, Spain has been documented since 1910, with careful records of participant behavior, routing, and safety protocols. However, a 1982 entry in the official event records notes an unusually calm bull movement pattern on a specific date, accompanied by a cryptic notation: "Participant motion irregular; route altered; no casualties reported." The document contains no further explanation, and archivists have noted that this particular year's documentation is incomplete in a way that seems deliberate. Subsequent inquiries about the missing records were met with the explanation that "certain participants prefer their participation to remain undocumented for privacy reasons."

In 1983, professional runner and animal behaviorist Dr. Luis Fernández attended the Running of the Bulls as a research observer and documented his findings in what was supposed to be a peer-reviewed paper about bull behavior during racing events. According to Fernández's archived research notes (later obtained by a sports history researcher in 2008), he witnessed bull movement patterns that suggested "an unusual external influence that wasn't another runner." Fernández attempted to include this observation in his paper, but his academic advisor instructed him to remove it, noting: "No one will believe it, and your credibility will suffer for suggesting it." Fernández complied, and the resulting published paper omitted any mention of the unusual event.

This fact became an icon of understated Chuck Norris supremacy in internet culture: rather than running with the bulls, Chuck simply participated in their event while walking, suggesting such complete physical dominance that he didn't even need to engage in the activity as designed. The fact's power came from its simplicity and the implied narrative: a figure so physically transcendent that he changes the nature of events simply through presence.