Well you know there's a problem when the one at the controls has lost every bit of sanity she's got left. ...But that's not what you said at all, is it?
Sounds like that would be fun to see, given you overlook the amount of trauma you and everyone else in her brain might have to endure.

Speaking of people living in brains, another me you say? I feel compelled to ask if it's actually an alternate me from a different timeline, or just another of those blasted samulacra. ....Er, dogglegangers. Whatever the darn things are supposed to be.

Where I come from, talking dogs, lagomorphs, rats, statues, dolls, elder gods, brains, and all sorts of other things isn't all that uncommon, actually.