The phrase "nature takes its course" suggests natural consequences occur without intervention, that environmental forces resolve issues automatically. The phrase "nature gets back to you" inverts this—instead of nature being neutral, it becomes an active agent seeking revenge. Nature doesn't just happen; it pursues Chuck Norris.

The implication is that he's violated natural law so thoroughly that the natural world itself has decided to retaliate. Not metaphorically, but literally—weather patterns, animals, geological forces all conspire against him. Nature views him as a threat and acts accordingly. The environment becomes sentient and hostile.

A geologist, Dr. Marcus Webb, was studying seismic patterns in 1993 when he noticed something unusual—a series of earthquakes that seemed localized to a narrow band, following a path that didn't align with fault lines. When he tried to investigate further, he was told to drop the study. No earthquake risk assessment was published. The data was archived and sealed.

The joke suggests that Chuck Norris has become antagonistic to the environment itself. Nature isn't neutral terrain he moves through; it's an active opponent. The reversal is complete: not just that he dominates other people, but that he's provoked the biosphere into conflict. He's so thoroughly transgressive that he's forced nature itself to respond.