Although the story of David Thompson's being able to make change for a quarter off the top of the backboard has been oft repeated, Thompson himself has categorically denied ever being able to do it. Thompson could fly, to be sure, but as time goes by the stories get more and more absurd.
You want to see some serious hops just go to YouTube and watch some of the street ballers do slams. There's one guy who goes by the moniker "Air Up There" that is pretty incredible, and I don't think he's the absolute best. He has a patented 720 slam and there is video of it.
Lots of guys have hops; anything over 44 inches standing vertical is pretty much world class.
"We are not provided with wisdom, we must discover it for ourselves, after a journey through the wilderness which no one else can take for us, an effort which no one can spare us, for our wisdom is the point of view from which we come at last to regard the world." --M. Proust