Ahahahahahahhahahaha @ lawnmowing zombies.
Sounds like a game my cousin would love. There was some game a few years back he was obsessed with that had like chainsaws and stuff. Don't remember what it was, though.
As for zombies, since my dad is a strange man who at almost the age of fifty has found his true calling in FPS... and doesn't really like playing alone, we play them together. Our latest conquest is Left 4 Dead on the 360. We also have a PS3, but we traded in the last game we had for that to Gamestop when my dad bought the 360. It was Killzone 2. Awesome, awesome game. I must say, though, as of now my all time favorite game is totally Resistance: Fall of Man. I miss that game. We beat it like five times. >.> <.<