1. Get 3-10 friends (4-11 total players with you included)
2. Start a private game (Freeplay->Private Match)
3. turn force team balance and rank restriction off
4. players must fill teams at a 3:1 ratio
5. players on the larger team are only allowed to use melee attacks (knifes included)
6. for the larger (zombie) team, buffs are allowed but abilities are not
7. have fun
With such variation in body types you either have heavy hulks or aliens-inspired light rushers.
Also, Mike Meyers for whom it concerns...
1. 3 players required
2. all players on the same team except 1 who is alone on the other team (loner is mike)
3. only mike is allowed to attack and only with melee attacks
4. when only one "survivor" player is left, they must duel mike in melee combat
5. If the survivor wins the duel, they become the new Mike. Players must switch teams accordingly.