One of the guys I work with pointed me to this site. They have a product call Chuckit! that allows you to throw tennis balls for long distances so you can play catch with your dog. The funny part of this product is the disclaimer at the bottom that reads:
WARNING! Read instructions before use. High-speed flying balls can cause injury. Do not use product to aim or throw directly at people or animals. Not for indoor use. Use only standard tennis balls or Canine Hardware balls manufactured for use with this product. Be alert, ball may travel in unanticipated directions. Adult supervision recommended for children.
I wonder if they have a compliance department...