I borrowed this game from another poster, and it turned out great. I had a lot of fun with the kids.
Wolf, Wolf. What time is it? Game:
Kids walk in a line behind the 'wolf', chanting "WOLF, WOLF, WHAT'S THE TIME?" the wolf gives random times "it's 1 o'clock, it's 5 o'clock..." etc. Whatever time. But then, at some point, the wolf yells "it's DINNER TIME!" and he turns around and tries to catch someone! Whoever is caught then becomes the wolf, and you start again.
If the kids aren't running because they're having too much fun being caught, I give points for NOT being caught, and then reward the person with the most points at the end of the game (which is whenever you want it to be).
This is better as an outdoor game if you have lots of students.