Backboard, Baby. Backboard.
On a handful of occasions, I have had the distinct pleasure of playing rec league hoops with a friend who can dunk with relative ease (most other people on my rec league team, myself included, are happy enough to slap glass).
In one instance playing alongside said friend, I had a breakaway layup and heard him call out from approximately 10 feet behind me: "Backboard."
Adjusting on the fly, I threw a relatively perfect pass off the backboard, and he soared in with two hands -- then bricked the dunk off the back rim. It was both disappointing and rather exciting at the same time.
For the record, Russell Westbrook did not miss the dunk attempt shown above.