It has been about as unusual as an early October snowstorm in downstate Missouri, an hour without a political commercial appearing on TV a few days before a significant election.
Those can happen, but it would be a memorable occurrence.
You can add the chances of the Kansas City Chiefs being an underdog in a home game to that list of oddities.
It has happened only three times in the last eight calendar years (dating to September 2014), and there were extenuating circumstances each time. Two occurred in 2019, games in which QB extraordinaire Patrick Mahomes did not play.