My eyes aren't what they used to be, but I believe I see at least three inscriptions that may help identify who made them:
1. Fill with soup, heat and add ANAKrackers.
2. Fill with water, heat, and take a nice warm Gath.
3. It's foggy out, turn on your Og lamps!
I could be wrong. But seriously, we were made in God's image and, like Him, we have the ability to laugh at our enemies. I'm not much with a slingshot, but I have a few things I might sling at them upon their return!