Haunted: the 'visible' invisible...

do you believe in ghosts? stupid question - nobody actually 'believes' in them...they are always known to cause harm to mortals so how can anyone 'believe' in them. but do you believe in the existence of ghosts?
well - there was this weird story in the newspaper about a she-ghost 'seen' walking on the runway of an international airport of a south Indian city.
weird and creepy...what we have learnt from stories is that if someone dies with an unfulfilled wish at heart, he/she becomes a ghost. so what's the deal with this 'she-ghost'? any guesses?

P.S. - be warned! dont try to make too much fun of the ghost. I have heard that they dont need a visa/passport to fly to another country.