Lets say a particular stock goes way high, may be in bubble territory. Somehow someone sold at or near top. And then stock tanks. Since one sold and it went down but 10-15% in a day or a week, the person tends to play with it. They would buy just for the reason they sold at good price. Than there may be dead cat bounce, and they sell it again at profit. This pattern is very dangerous coz person tends to believe he is expert on that stock's movement. I have seen that lot of times and sometimes they even loose money overall after very nice profit, because sometimes they even increase position than they had originally. I have been there, done that long time ago and I am very careful not to do that.
I would like to ask question to toher members. Have you been there?
One way to avoid that ignore that stock for few months(my preference) or take very small short postion that your mind set is not in buying that stock.