I don't like to advise too much, but given it's snowing and winter is coming, I ask that people please think of the consequences before putting rocks into snowballs.
It's not funny. It hurts people. Don't hurt people. Just throw a snowball.
And before anyone asks, yes, this has been a problem before, especially when scientists listen to super soldiers and think throwing rock snowballs is hilarious. It's not. It's a pain in my ass!