The Push 'Panic' promotional video features something I'd gladly do for free if I ever decided to participate in a commercial.
The Push is a skate shop based in Malaysia. The company decided to promote itself by having a water balloon fight in a park. The clip starts off with a skateboarder cruising along, who then gets targeted by unexpected guests. Soon enough, the park explodes into a huge water fight with skaters everywhere targeting one another with every balloon in their arsenal. If you don't have a water gun or can't bother buying one, then the Push 'Panic' clip should inspire you to have a water balloon fight instead.
With summer coming up, you should put the water balloon fight on your to-do list of summer activities.