I first encountered this game from another forum I was active in several years ago, and just recently recalled playing it. This may have already been played before here, so excuse this thread if it has.
Anyway, the rules are simple: Just pick anything that comes to mind, and pass it to the next poster. The next poster will then catch (or do something else to) whatever was thrown, then pass a different object to another. For example...
Poster 1: Catches a grapefruit. Flings an unwashed sock.
Poster 2: Evades unwashed sock with his mad ninja skills. Launches an incendiary grenade.
As the example shows, you can be as creative (or as unimaginative) as you like, both with the receiving and the passing. Be as random and as unpredictable as you can!
Allow me to start the game...
Winds up, then throws a Master Ball at high speed.