>>44805
When people ask such questions, like 'what are ghosts?' or 'does personality survive after death?' they always seem to start from the assumption that there is a 'you' in the first place. That's not surprising, after all, it's how we think of ourselves while we're still alive. We'll say 'I like this' or 'I think' but what if we were fooling ourselves? Or rather, what if we were letting ourselves be fooled by language?
Consider this: it's common knowledge that human beings are contradictory. We're able to feel different emotions that don't seem to mix very well together, and even to love and hate someone or something at the same time. So we might say 'I love you' and 'I hate you' in the same sentence. That doesn't make sense if it was a single entity that was speaking, but it would be perfectly reasonable if there were different Is, all inhabiting the same body, taking turns to speak, and identifying themselves as 'I' simply because it's more convenient than each of them using a different name, and also because from an outsider's perspective, one body = one person.
Many philosophers have questioned the existence of a singular, monolithic, homogeneous personality, instead proposing that behind that I there exists a multitude of wills or instincts, which may or may not want the same things. The person we think we are, therefore, would be an aggregate of many smaller Is, all sharing the same body and memories, but sometimes disagreeing with each other.
Why is this relevant to a discussion about ghosts? Well, assuming that something survives after death, we have to ask, which parts of us do manage to survive? Imagine for example that you woke up tomorrow with your personality intact, but no memory of who you are or what your life has been: would you act the same as normal? Or what if certain parts of your personality, that have so far been dominant, suddenly disappeared, allowing other weaker and normally less influential parts to dictate your actions? Would 'you' still be the same person?
Maybe your grandpa turned into a ghost after he died, but only half of 'him', thus he might act in a completely different manner from when he was alive. The ghost's behaviour might not match what we remember about him, or even seem nonsensical or scary.