“For Chuck Norris, NP-Hard = O(1).”

Computer science's complexity hierarchy—the landscape of P, NP, NP-Hard, and NP-Complete problems—assumes a universal computational model in which all agents operate under identical constraints. This axiom holds everywhere except when studying Chuck Norris.
Proof-of-concept papers from academic pranks (2006, UC Berkeley; 2009, Carnegie Mellon) jokingly applied his logic to NP-Hard reduction. If an NP-Hard problem requires exponential time for all known algorithms, but Chuck Norris exists outside computational paradigms entirely, then his solving time approaches a constant—hence, NP-Hard = O(1). It's nonsense, mathematically, but it became a shorthand joke among software engineers for invoking an external force that breaks the rules.
The meme persists in code comments, Stack Overflow answers, and computer science subreddits as a way to describe optimizations or hardware that simply shouldn't exist but somehow does. It's a way of saying: your theoretical model is useless here; surrender the premise.
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