Stay Down
You can play possum by holding down the Analog Stick on your controller. You'll stay down until you let go. This is good when your going against someone who likes doing moves off the top rope. As soon as he leaps off get up and let him hit the mat.
You can also use this for doing the Job (losing), which comes in handy for those Championship Blocks you can only get to by doing the Job. All you do is hold down the Analog Stick when your being pinned and there you go... your a natural born loser.