Pros:  Big fun
Cons:  Needs a good area with coverage

From ehow:

     Steps:
       1.
         Select an object to serve as the "can" - an actual can, a ball, or a small, taped-up box. 
       2.
         Select someone to be "It." 
       3.
         Select an area to set the can - a clear space about 20 or 30 yards across. 
       4.
         Select an area to be the "jail" - a comfortable place close to the can, but not blocking the can. 
       

         Tips:

         Place the can in a grassy area, if possible, since players may have to slide or leap. 

         Select a well-lit area to place the can when playing at night. 
       
      If You're "It"

         Steps:
       5.
         Stand by while another player kicks the can as far as possible. 
       6.
         Retrieve the can and put it back where it was in the beginning. 
       7.
         Capture players by calling out their names and their hiding places while you're stepping on the can. 
       8.
         Look for players, but try not to stray far from the can. 
       9.
         Race back to the can if you see an uncaptured player headed for it. 
      10.
         Step on the can and call out that player's name if you get to the can first. 
      11.
         Run after the can and put it back again if that player kicks the can away. 
      12.
         Continue until you have all the players in jail.
       
      If You're Not "It"

         Steps:
      13.
         Select someone to kick the can as far as possible. 
      14.
         Hide. 
      15.
         Race back to the can and kick it before It gets there. 
      16.
         Go to jail if It steps on the can and calls out your name and your correct location. 
      17.
         Wait in jail until you are rescued - that is, until someone kicks the can. 
      18.
         Run away and hide again when the can is kicked and you are released from jail. 
      19.
         Be It for the next game if you were captured first. 
       

         Overall Tips:

         Captured players are free to scatter and hide while the can is kicked and It replaces the can. When the can is
         replaced, It can capture people again. 

         The game ends when all players are captured. 

         Wear dark or camouflage clothing and a good pair of running shoes.
       

         Overall Warnings:
       
         Beware of dangerous objects, cliffs, drop-offs and traffic, especially at night.