Botond Dajka from the acrobatic basketball dunk crew Lords of Gravity did a dunk off the backboard at an NBA streetball event at Spain. Not pass the ball off the backboard, but he jumped and flipped off the backboard.
Though, to be fair, he didn’t actually “dunk” the ball, just like Dwight Howard and Blake Griffin didn’t really “dunk” the ball here and here either.
Don't try this at home. (Why would you?)
[Ball Don't Lie