Stag Night of the Dead

On his stag night, Dean go with five mates (and a stripper) to play 'Zomball' at a top secret military compound where you get to shoot zombies with huge stun guns. Disobeying the golden rule of Zomball ('never never humiliate a zombie') the stags face overwhelming odds from the massed undead and each stag is hunted down. (imdb)