Am I reading this right?
Fish decides he's going to do something. He is then physically assaulted by Fineas, who is an alternate personality sharing Fish's body. Fish and Fineas have an argument, Fineas says Fish can't save the multiverse and disappears, leaving his goggles behind.
So, I'm thinking that the whole conversation between Fineas and Fish took place inside Fish's mind, and none of the others in the Pub Stub are aware of it--and the Fineas personality has just self-destructed.
Thoughts? Arguments? Alternate ideas?

He hasn't self-destructed, I don't think. He's biding his time - this doesn't seem like a suicide, more like he's just holing up to watch the horror from a comfy location, so he can gloat about how he was right in exhaustive detail later.

Fineas is kind of a bastard.

Considering the background is of the bar in fish's mind, I'd think you were correct about it occurring in his mind.

So, I'm thinking that the whole conversation between Fineas and Fish took place inside Fish's mind, and none of the others in the Pub Stub are aware of it

Umm, considering the location they're in is the pub of Fish's mind... that would be the right assumption.

However, I'm not agreeing with your claim that the Fineas personality is self-destructed.

Yay! Fish has his innocence back! If only all of us could be so lucky...

In Response to Deathalicious (#36170):

Yay! Fish has his innocence back! If only all of us could be so lucky...

Yeah, you'd have to go back to my childhood and wipe out all those Sid and Marty Krofft reruns first...

I think I'm in the 'alternate plane of conciousness' camp. Fish and Fineas had a real conversation, just not in our normal reality...

Kinda like Fight Club, but less testosterone and MeatLoaf