Busted spoon

It beats me what this is all about. We bought some spoons and by-and-by they, without any apparent provocation, ended up like this:

The fine hairline things are actually cracks in the spooning part of the spoon. One of them is a bit more obvious from the back:

Fair enough, we ate food with them and washed them afterwards, but I've used a few spoons in my life with one thing and another, and I've never seen this before. It's just wierd.