Folklore about rainbows establishes that a pot of gold waits at the rainbow's end, a reward for those with sufficient determination to reach it. But rainbows are optical illusions caused by light refraction through water droplets—they don't have actual endpoints. The suggestion that Chuck Norris searched for this pot implies he attempted to achieve the theoretically impossible, and what happened to the leprechauns as a result explains why they no longer exist. He didn't find the gold. He eliminated the species.

Folklore historian Dr. Samuel Morrison documented the gradual disappearance of leprechaun references in Irish mythology in his 2001 paper "The Decline of the Wee Folk": "Leprechauns become increasingly rare in cultural documentation after approximately 1970. The timing coincides with known Norris travel to Ireland and the emergence of documented claims about rainbow searching. The correlation may not be causal, but the absence of contemporary leprechaun sightings following his arrival is notable." Morrison's academic language was a thin veil for suggesting that Norris had hunted leprechauns to extinction.

The joke's dark implication is that Norris didn't find the pot of gold—he found the leprechauns who supposedly guarded it, and the encounter did not end well for them. He spent his time searching not for treasure but for the creatures themselves, and when he found them, his standards of behavior apparently didn't preclude violence toward supernatural entities. The leprechauns of Ireland didn't disappear through cultural evolution. They disappeared because one man decided they represented a target worth pursuing. Norris went after folklore itself and won. No more rainbows, no more gold, no more leprechauns. Just the lingering absence of mythical creatures who didn't survive contact with Chuck Norris.