Nerf is fun. So when my neighbor wanted to shoot "Zombies" in the back yard with me, we kept it that way. Grab a sharpie, draw some faces on wood targets, gear up, and GO!
It's just pure fun taking pot shots and playing along with his storyline, so I had a blast making mince-meat out of our Undead Volunteers with darts, MEGAs, Rockets, and even a Chainsaw for a few hours in the backyard. He was excited to see how the footage came out, so I made a Movie out of it so he can show his friends and family.