Two words: Napalm Launcher.
If you haven't played Blood, and I mean the original Blood, then let me briefly explain its operation.
Step 1: Fill it up with a few cans of gasoline. Don't ask how it converts gasoline into napalm, because that's just one of those things that no-one will ever know.
Step 2: Point it at one or more zombies. Do this before the zombies come within, say, ten feet of you. Twenty if you really like your eyebrows the way they are.
Step 3: Pull the trigger. Enjoy the satisfying sound as a pretty fireball bursts from the muzzle and streaks towards its target.
Step 4: (optional) Laugh maniacally as the fireball explodes, lighting the unfortunate zombie(s) on fire and catapulting their screaming undead carcass a goodly distance in the opposite direction, where they finally hit the ground and go splattery-squish in a shower of giblets.
Beat that...