Dwight Howard of the Orlando Magic with a powerful one-handed tomahawk slam against the New Orleans Hornets on February 26, 2010.
The Hornets ended up winning the game 100-93 after the Magic squandered a large lead.
Superman is usually highly successful on this type of shot!

NBA all-star Dwight Howard throwing down a two-handed slam during a pickup game at beautiful Venice Beach in California.
Howard posted the photo on his Twitter (@dwighthoward) to his more than 1 million followers.