Lord of the Rings: The Return of the King - How Did Frodo Survive?
Near the end of the movie when frodo and sam are inside mount doom an gollum steals the ring, frodo then pushes gollum off the cliff and frodo follows him. You can clearly see that frodo falls off sort of head first and is facing the complete wrong way to the cliff, so how could he turn him self around and grab onto the cliff before he falls to his death?
He fell sort of sideways, but mostly straight up, not head first. And when you see him again, he's halfway down the cliff, which is plenty of time to turn around, especially for a hobbit since there shorter.
This has always bothered me too, for one this event wasn't in the book, just added to provide some suspense in the end. In fact, Frodo didn't even fight for the ring back, Gollum was jumping for joy and just fell off! :-)