In The Battle of The Five Armies, during Azog's attack on the city, Bard's children are about to be crushed by a troll (I think it's a troll, or maybe an ogre).
Bard, seeing this, grabs a nearby wagon and rides it down a path towards the troll, jumps the wagon over his children, collides with the troll, flies through the air with the troll and lands on top of the troll while simultaneously stabbing it in the heart.
Did this scene take place in the novel, or was it added for the movie?