I mentioned it earlier, but go find vids of Dunk League. They do it right.
There competition is a multitude of different rounds and stages to advance..
- Lightning round of a minute....get in as many good dunks as you can in that timeframe
- The assist...Need to do a dunk with someone assisting you (throwing it to you, jumping over them, etc)
- Lower the hoop to 9 ft (this one gets crazy)
- Keep raising the hoop to see who can flush one at the highest point
- Mimic a past memorable NBA dunk but put a modern spin/addition on it
These guys are out there doing Scorpions, Double through the legs, 2 elbows inside the rim...just ridiculousness.