This is a mix of amusing and horrifying:
In brief: People eat a remarkable number of calories at Thanksgiving, but it is after all a feast day. What's really amazing is how much people can eat in meals that don't really look all that huge at restaurants. Examples are given.
Personally, I like to remember that food "calories" are in physics terms really kilocalories. Hence if you're on a 2000-"calorie" diet and that sounds limiting, just remember that you're really eating two million actual scientific calories. Granted, you don't actually get to eat any more, but I still find in cheerful to think that when I snack on a little 210-"calorie" cupcake I'm really enjoying 210,000 calories.