Snowball

In Club Penguin, you can throw snowballs. These are usually used in wars or when a penguin is annoyed or mad at someone. If you want to throw a snowball, click on an icon on the toolbar to the right of the chat line. It will have a white circle on it. After you click on the 'throw' button, you can aim and fire! In the water party, snowballs were replaced by water ballons. You can also throw a snowball by pressing "t" on your keyboard. Rapidly pressing the t key on a keyboard, then clicking, only shows occasionally, so players can't "rapid fire".

Throwing Spots
The Snow Forts is used to hold snowball fights. Also, if you throw snowballs at the target on the Clock Tower, the target will spin upsidedown. According to the Penguin Times, doing this helps the clock move.

Trivia

 * In both of the Water Parties (Water Party 2007 and Summer Kick Off Party 2008) the snowballs were replaced by water balloons.
 * In the April Fools Party 2008 the snowballs in the Lighthouse and the Beacon were replaced by paintballs.
 * On The Stage if it is Team Blue's Rally 2, snowballs were replaced by dodgeballs. These bounced like basketballs.