He finished his task with much grumbling right on time, the day before Thanksgiving.
He was so glad to be done digging that he didn't even mind when he was told to fill it up again...
Now for the surprise ending...
The next Thanksgiving the teenager was on the African Continent in Mozambique.
It was the rainy season in Mozambique; it rained constantly. The teenagers father and mother had, in a small way, been sharing his experience as it had rained for days and days at home also. Luckily the rain stopped. The day before Thanksgiving, the teenager's father decided to cook pit turkeys yet again (the nice square hole was already dug after-all).
The father filled the nice square hole with wood covered in lighter fluid. He lit and fed the fire for three hours. The teenager's mother though the father might burn their trees down as the flames seemed to stretch higher and higher.
The next morning, the father shoveled the dirt away and removed the metal roofing to retrieve the turkeys.
While the father was preparing to unwrap a turkey, the mother walked into the house and said "What is that smell?" The father explained that he had made a rub with a special blend of herbs but the mother worried that herb blend was labeled "Death and Decay".
When the foil wrapping was removed to reveal raw turkey, the father could no longer live in denial as the stench of rotting carcass blended with hickory coals permeated the house maybe even the neighborhood.
It was then the father figured out what he wished he would have realized the day before. A three hour fire may dry out a nice square hole and produce plenty of red hot coals but the moisture in the ground surrounding a sealed nice square hole will condense on metal roofing and put those red hot coals out. This warm cozy environment provides the perfect condition for 12 hours of bacterial growth and probably fatal botulism.
The father never had the heart to pit cook again.