I believe a corrupted save lead to this, but as you can (possibly) see in the screenshot it happened in Riverwood. This mudcrab follows me, and is not hostile. He is basically a follower, except that he does nothing else, except follow me. I have the save archived and have not been able to reproduce it otherwise. Is this a vanilla bug, or the result of a mod flaking out temporarily?

I fail at posting images here I guess. Shows up in the preview, and reverts to code in the post.

[img]http://i.imgur.com/6S5h9.jpg[/img]

Congratulations, the greatest thing ever has just happened to you.

Probably you have W.A.T.E.R mod or RWTT mod. They both add hidden mudcrab follower. He has a name - Crabalot.

Yeah, since Realistic Water Textures and Terrain mod changed hands, a crab follower (as well as extra under water chests, etc.) got added to what once was just a graphics mod. Pretty annoying if you fall victim to it, but the latest version of the mod requires you to actually read some hidden note to trigger the crab follower (I have no idea where it is, nor do I have any interest in finding it) so it's avoidable. I'm not sure how you get rid of him if you inadvertently get him though. Probably go onto the Nexus page for the mod and ask.

Probably you have W.A.T.E.R mod or RWTT mod. They both add hidden mudcrab follower. He has a name - Crabalot.

Funny thing is, I've had RWT for awhile, and haven't updated it since it stopped being supported. The crab is totally new to me. Good easter egg.