ghost and its present infront of some peoples and what is its scientific basic ?

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yesterday i heard a news. a neighbor said to someones that he saw a ghost of a suicide person. but i dont believe in it. but is it true ??? i never believe on it. but i google in network. then i see something more intrested things about it.but im confused in it. because i cant get the correct solution for it. is it true or false ??and why dont the all peoples cant see this ghosts. ??many peoples are walking into the same places before and after. but they didnt see any of time before and after but i search again but heard again this matters in different places. but is this stories are true or false ??when analyse this by the religious it is possible but in scientifically how it be possible ???