As a mere mortal, I can perform a 360 dunk only if I jump off a trampoline.  Make that a bouncy trampoline.  A really bouncy trampoline.  To get high enough to spin before you dunk it, an unathletic shrimp like myself needs an extra boost.

But even on a really, really bouncy trampoline, I couldn’t do what Deron Washington does in this highlight.  Not only does he do a 360, but he does it the wrong way, and while putting the ball between his legs.  What’s the wrong way?  Try doing a 360 on a 6-foot rim.  You’ll intuitively spin one way.  He goes the other. 

He can also jump over Greg Paulus, and Danny Green, but this 360 between-the-legs dunk is the most impressive I’ve seen from Mr. Washington.