You know...I wouldn't mind putting a leash on that crab and naming it Pinchey Jr. and taking it for a walk on the beach. It's sure to make all the ladies look your way. ;)
I'm thinking if you put a stick through it and grains in the bottom you could easily use this like a grain crushing device to make some sort of bread. Stick this on top of a slightly bowled shape rock for a base and drop grain into it. Many primitive societies that still exist around the World have similar looking devices to crush grain, nuts, or whatever other food source to make a flat bread like food.
Looking over the comments I'm amazed by the amount of times our Neatorama readers contemplate how to dismember a zombie. If there is ever a zombie apocalypse I'll be glad to have any of you beside me in a fight. :D
Not actually related to the topic per say but I have a part time job working as an Inventory Associate where I go around to various shops/stores after they close up and do an inventory count of their remaining products. It's amazing what kind of stuff is made where.