On initial viewing of this clip, which looks like it was capped from a VHS tape, it seems we just witnessed the greatest fast break dunk ever: an in-game between the legs dunk with the player getting head and shoulders above the rim. On closer inspection, you can see he was able to get a boost by jumping off the back of a teammate.

In 9 out 10 instances of people attempting this dunk, it becomes material for AFV or Tosh.O, so props to these guys for not only avoiding a major dunk FAIL, but by executing a "real life gamebreaker."

This is how the dunk (and the dunker) usually go down.

There's a few more in this dunk Fail compilation - the best is at the 2:47 mark.