Croi DhubhSo i guess that strange guy that i sometimes see talking to himself and yelling on the train is really just a normal guy that has special powers. How cool!
Just because someone can see or hear things you cannot, does not make them crazy or mentally unbalanced.
sorry, but I think Croi is right. there's medical explanations for such things that doesn't label the person as being mentally unbalanced, much less crazy.
It could easily be damaged/infected eardrums which causes you to hear some weird stuff, etc.
Hell, once in a rare while I keep on seeing glowing fireflies everywhere I see for a couple of seconds, and they're not actually there. The reason why I sometimes see them is due to an eye condition where you can move your eyeballs in all sorts of angles that most humans can't do. even the rolled-back eye trick where people can only see your eye whites, but not your pupils. This can cause flashing lights or fireflies to appear if I happen to move my eyeballs in certain directions too fast, or when I stand up too fast.
those are conditions which has completely nothing to do with an person's mental state, and they still count as hearing and seeing things that aren't there.