An Odd Nut!

While setting up a screen house in the back yard for summer barbequeing I was picking up debris so it woulnd't be underfoot. I picked up this intact walnut shell, and having a particular likeing for walnut shells for casting, I put it directly into my pocket, not examining it any further considering I was already engaged in another project.






When I got inside the house after setting up the screenhouse I emptied out my pockets and at that time took a look at the walnut I had just found and discovered this:
The shell doesn't divide into two halves as normal (sorry to use that word,) it cleanly divides into three. The nut inside the shell had not developed or had become rotten so it was never opened by a squirril, thus leaving it intact much to my pleasure.
Not sure what I am going to do with it now, except enjoy it's individual oddness, but I am sure something will come to mind.