Actually overeating 3500 calories is not that hard to achieve (not that I see that as an achievement). It still counts as overeating even if it's spread thru the whole day, not just at the Thanksgiving dinner.

Good news is even if you overeat 3500 worth of calories you are not going to pack a pound of fat. Calories in=calories out myth has long been debunked.

It works the same way when you try to lose that pound of fat. You have to sweat a lot more than 3500 calories.