In my first contest in over 20 years, the 2004 Surfer Bowl, I had someone call me off the right who then went left in the final. I was a bit surprised but I did remember some of that went on in the NSSAs in the early 80s.
I talked to Jack about it and he was a bit surprised as well and suggested maybe we start a thread about this topic. The recent Worlds and Darcy's and Albert's post have no doubt raised interest in this topic so let's see where it goes.
What works (help me here, I don't speak from experience

Being in superior shape
Mental toughness
"It's all about wave selection, getting the best waves" J.Beresford Feb,2004
Sound strategy
Being prepared-having pulled off that move in both 3' slop and 6' peelers helps
Being well rested, hydrated, and fed (not the mondo breakfast burrito 15min prior to your heat!)
Confident in your equipment, having the right board for the conditions
A good attitude
What sucks
Sitting on people to prevent them from getting in position
Saying you're going to catch it, and not
Saying you're going L or R, and going the other way
Teaming up on people with others to shut them out
Bad attitudes
Stink eye
Thinking better of yourself than you should, if it leads to impure competition
Thinking you're bigger that kneeriding
In the USSFs I did not make it out of my first heat (no repercharge either

Albert, I believe you are standing tall today because your performance in the Worlds was phenomenal, and was achieved by skill, conditioning, and mental toughness to name a few!
KSUSA: anything to add????