One of the coolest tricks is to throw a BIG order in during the last 2-3 minutes of the close...watch the MM's scatter AND see who is there for real or not. (Missed it, so didn't see what happened).
Also, if you have an Etrade account (they are idiots)...if you put a BUY order FOR THE DAY in for 5,000 during the last 15 minutes and it doesn't get filled, they represent it the next day. Usually works. Its a great way to "show" bid support. The only problem is that if Etrade gets stuck buying it during the next morning they sell it as fast as they can.