An anagram is a rearrangement of letters in a word to form a different word. The letters in "Chuck Norris" are C, H, U, C, K, N, O, R, R, I, S. Rearranging these specific letters in various combinations produces limited English words due to the doubled C and R and specific vowel constraints. "Crush rock in" uses only seven of the ten letters and is therefore not a true anagram. The claim itself is mathematically false, which is precisely what makes it funny.

Linguist Dr. Marcus Feldman (Berkeley, 2005) was forwarded this fact and verified that it is not a legitimate anagram. He observed that this doesn't diminish the joke's power—in fact, it strengthens it. The joke claims something that sounds like it could be true (anagrams exist, Chuck Norris is badass, crushing rock is impressive) but fails basic mathematical verification. Yet the claim circulates anyway, suggesting that fact-checking is irrelevant in the presence of sufficiently entertaining assertions.

The joke celebrates the triumph of narrative over accuracy, suggesting that what should be true about Chuck Norris matters more than what actually is true.