MATERIALS: A ball (football/baseball works best--a water balloon would be nice, too)
One person is the thrower.
Everyone else clusters about throwing distance away.
The thrower throws the ball and yells a number between 1 and 500 while the ball is in the air. (Bigger #s make the game go faster). Whoever catches the ball gets that amount of points, but if they drop it they must subtract from what they already have. (NOTE: You can't get negative points, so the lowest score is always 0.)
Repeat this over and over until someone gets 500 points. (But you can play for less points, too, if you want a shorter game.)
NOTE: This is a great math skills (addition and subtraction) game as well.