If that sounds cool, then I recommend HALO QUIDDITCH. A basic game of Halo Quidditch would be something like this one that has 5 players on a team.
1. If a wharthog touches the other team's tower, your team gets one point. The wharthog is both pushed by tanks and moved by grenade blasts. So you have one man on each team in a tank, one on each team running around with infinite grenades. No aiming at other people.
2. Each team has a goalie stationed on their tower using rockets to deflect oncoming wharthogs. He's not allowed to move off of the tower.
3. Each team has a guy running around with a plasma pistol (parallell to quidditch "beaters" shooting enemies, or shotting the other guy with a plasma pistol.
4. One guy on each team runs around all over the field hitting a ghost with a rocket launcher to score more points. Use the cliffs behind each team's base as goals: if a ghost touches the enemy's cliff, you get one point.
5. Come up with any parallell you can think of to the Golden Snitch. Or leave it out.
6. Always, always email Strong Bad.