They always show these sort of charts..... I can pull up a dozen + charts showing how good the markets do a day before xmas or the day before 4th of july. It gets old....
Something else to be aware of. Back in the day I remember the day after Thanksgiving can sometimes be very volatile. This was when we had a real strong market. I think a lot of people that take the day off do some trading. Something to think about.
Light volume begets volatility. It doesn't take much to push the price around when volume is light because the same level of excess buying or selling that on a heavy volume day would have a small effect represents a more significant fraction of the overall volume when volume is light..