Two people are designated as “apes” and are given sticks (bats, pool noodles work well, etc.) Everybody else is designated as a “monkey”. Put about 4 or 5 nerf balls into play. The apes’ goal is to hit the monkeys with the balls…when a monkey gets hit he/she is frozen. If all the monkeys are frozen the apes win and you start a new game. The monkeys’ goal is to hit an ape with a ball (the apes use their sticks as shields.) If a monkey hits an ape then they switch (ape gives stick to monkey and becomes a monkey), and all the frozen monkeys are unfrozen. Loads of fun.