Without some friendly competition, parties are boring and sports are speed walking. Pit friend against friend with today's Groupon: for $175, you get a three-hour bazooka-ball party at a location of your choice from Jump for Fun (a $400 value). The party includes:

• Two staff members
• Setup and takedown
• 10 bunkers
• 10 Bazooka guns
150 reusable bazooka balls

The party-prop experts at Jump for Fun turn group gatherings into foam-hurling showdowns with refereed games of bazooka ball. Two staff members travel to the client's location of choice to set up the game materials, keep up the energy, and monitor the horizon for enemy invasion. Up to 10 players barricade themselves behind soft bunkers to pelt each other with soft 2-inch Nerf-style balls propelled from modified paintball guns. The fast-paced games continue for three hours as opponents yell with victory and yodel in defeat, and players pause from the action only to sit out momentarily after being hit or to reload. No eye protection is required, as the balls make a minimal impact, are safe for children ages 6 and older, and make a pleasing popping sound as they fire, akin to uncorking a bottle of vintage fruit punch. Click here to see a video of bazooka ball in action.