Nice Fishey Rich,

I have this happen to me every once in a while, and in thinking back it normally happens when the fish takes it hard, like a Mack truck.

My personal opinion is that they are going fast, or the lure is going fast, and its just that bit of extra speed that makes them miss the hook just a bit. Or they swipe at the head of the plastic and catch the hook a little low.

Good thing your hooks are sharp:)