During the intermission sequence with Fat Zombie, quickly run on the left side of the downed power line and the mini fence. Once there you should find a trampoline. Jump on it and stay on the houses. The Exploding Zombies cannot hit you, but will damage Fat Zombie. When you see Fat zombie jump, run to the right onto the taller house and you will not be dazed. Continue hitting him with your nailguns and throw your bombs at the tree so that they will bounce back at Fat Zombie until he has been defeated. This is helpful in Horror, when you fight two Fat Zombies.