This thread makes me sad

You would think in this day and age people would have a bit more intelligence than believing in this sort of shit.
Before people start telling me their experiences and/or giving me pseudo-scientific theories on ghosts remember:
The human brain is what controls you and your personality.
If you get a bang on the head it can drastically change your personality, it can literally turn you into a different person.
so how the fuck can your personality still exist when your brain is dead??
(hint: the answer is it can't) Before people say it's your soul or whatever, why do we have a brain then? and why does brain damage change your personality if that is decided by your soul?
There are a million other reasons believing in ghosts means your being stupid, but that one alone beats any and every argument you all have. Well, that and the fact we know why people believe in ghosts! (A lot of reasons, such as this-> http://news.bbc.co.uk/2/hi/science/nature/3046179.stm , conformation bias, pareidolia, tiredness...etc)
EDIT: Silly, naive, me. I forgot to add one of the biggest reasons people 'believe'. ££'s, $$'s or whatever your local currency. Whenever there are stupid people, there are smarter people ready to exploit them.
BTW, on the flat earth myth. This had probably been said, but anyway:
1. Since the ancient Greeks (at least, maybe earlier) we have known the earth is round.
2. Pretending scientists ever thought the world was flat, they would (quite rightly) only change their minds when someone
proved it wasn't flat, or rather provided evidence that meant that a spherical earth was more likely than a flat one. (That is a good thing. If I say tomorrow the world is actually a cube I better have some damn good evidence to back it up.)
3. Again pretending science ever believed in a flat earth, surely the fact scientists are willing to change their views when new evidence is found shows that if there was evidence for ghosts, science would acknowledge it!
tl;dr Stop being silly, do some research on why human perception is actually very easily fooled before you say ghosts do/might exist.
And I know this has been said but it's worth repeating,
Extraordinary claims require extraordinary evidence