In a high school basketball game last year, Izzy Wagner of Mount Miguel High School (Spring Valley, CA) had a clear, unopposed dunk. But he missed. He saw this while still in the air. So, hanging from the rim, he grabbed the rebounding ball and secured a dunk.
Alas, it was for naught. Sports on the Side, a news site for sports in the San Diego area, informs us that the rules of basketball do not permit dunking while hanging from the rim.
-via 22 Words