I only saw the closing laps of the most recent Bristol race, (I was busy watching my Virginia Wahoos win the ACC Basketball tourney in Greensboro over those Duke Blue Devils and earn the #1 berth in the East regional - Go Hoos!) but I did see the caution lights come on at the end, leaving DW speechless for once in his career.
When nobody could find a reason for the caution, it was reported there was an electrical short from all the rain.
Later, Robin Pemberton of NASCAR admitted that an assistant flagman had leaned on an "over ride" button at the flagstand, turning on some of the lights and leaving NASCAR powerless to turn them off.
I am guessing that the Duck Boy was flying away so quickly in those final laps that a bunch of duck feathers temporarily blinded those on the flagstand causing the excited flagstand occupants to trip the switch.
Your theory?
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"Any Day is Good for Stock Car Racing"
updated by @dave-fulton: 01/06/17 11:02:57PM