From part one: when you're thrown into a trash compactor after you're ambushed by the female ninja assassins' bigger boyfriends, a crowbar is enough to get back up and find all your lost weapons within 15 minutes and kick some major rear end.
And in part 2: circular saw blades seem to have a built in leveling device that keeps them flat, so it's easier to devide zombies into a top and bottom half.