me and my friends used to play a game called presidents and assassins.
You split into teams. One team are the assassins and the other team are the president and presidents guards. One member has to elect himself president and the others on that team are his guards and they have to protect him.
usually we would have about 6 a side and we used to play at night around my neighbourhood. Basically the rules of the game is that the assassins have to kill the president and the presidents guards must protect him and also play offencively. If the the assassins managed to kill the president, its game over, but if all the president and presidents guards manage to kill all the assassins, then they win.
When I say kill, I mean don't really mean KILL. your lifeline is a plastic bag wrapped around your arm. If it's removed, your dead. Some people were clever and tried tieing it on really tight and things got real physical. A few actual fights broke out, which is +10 awesome when you're 13.
We also played a few variatons on it called Fox and Hounds. Once again you split into teams, Foxes and Hounds. The Hounds are the offensive and the Foxes and defensive and are trying to get home. There is a designated base, which the foxes must reach. If hound comes up to you and grabs you, he must say "Fox and Hounds 123 'your name'" then you're dead. The game's up when either all of you are dead, or some got back to the base. When no one is left playing, the teams switch. The winners are the team with the most foxes that returned home.