A fairly high level caster can use Wall of Iron to create several hundred tons of iron with one spell, then use Fabricate to form it up into 10,000 lb coins with his face on one side, then use Shrink Item to shrink them to 2.5 pounds each, then drop then from a high place with Fly spell and Dispel Magic. From 400+ feet up, an 8 foot wide, 4 inch thick coin should do 70d6 damage to whatever it lands on. Are there rules for hitting specific things, or is this only useful for general mess making? It's inspired by those charity coin donation bins that involve trying to land a coin on a small platform through water.