The latest thing found on Mars that looks a bit like something else has caused consternation on conspiracy blogs.
This time the weird object looks like an alien skull, but isn't, obviously.
The rock was discovered by the $2.5 billion Curiosity rover, currently trundling about on the Red Planet's surface.
And it is pretty interesting, if you're trying to make it look like a skull in your mind, even though you know that it's not a skull.
It appears to have defined teeth and a jaw. Some bloggers even claim it has a "metal blade or arrow embedded in the jaw bone".
Well, it does when you edit the picture to look like this:
... Which is the sort of thing these people do.