Ok, here’s a fun one:

When people have their corpus callosum split, the part that connects the two brain hemispheres, there’s often different personality traits that will emerge for each hemisphere, such as one being religious and the other atheistic.

So the question is - where do the emergent personality traits come from?

When the brain is connected, do you effectively have psyches that are simply sitting there suppressed waiting to come out? Or is the you right now a mixture of personality aspects located in both sides?

What about extending this to the concept of the soul?

Is it still one soul in the body split into two, such that the one hemisphere could doom the other with its disbelief, or is there now two souls in one body - and if so where did the other one come from?

Are we actually individuals, or just a hodgepodge of different subconscious identities that’s fooled themselves into thinking they are a single mind, just an accident away from being thrust into their own isolated lobes to define themselves anew separate from the others?

And if that split were to happen, which side would the ‘you’ experiencing this moment right now end up on?