An issue i have seen pop up quite a few times the past couple weeks has been the urge by myself and other traders around me to chase a trade. The psychology of being left behind is the driver behind the "Chase". Here is the trade setup:
You're left behind, the trade is running, you see offers being taken, you see panic buying, 5-10-50-200-500 lots buying on the offer.. The chart looks like a rocket ship (on a 1 min mind you).. you give in you take the next offer. *what happens next is what i have found happens 70% of the time.
BOOM someone smarter than you just dropped a market order on the bid in stock
PPS drops back, options holders get scared and hit the best bid, boom each price levels are exhausted until everyone is done puking what they bought during the rocket up