Does Ghost exist?

I don't believe on ghosts, they lie so much. I have seen so many things if I say I don't believe on them, I would been lying, there are so many movies and pictures on the net, "I know that the most part of them are fake", but there are some real ones too.

Ghost may exist. Olden days haven't seen any bacteria. Now we could see it through special lenses. Ultrasonic rays are not visible, but could be sensible. In the same way, ghost may exist and we didn't find any method to see it.

Hi! I really don't believe in ghost. They are just superstitious beliefs. I don't believe on it because I really haven't seen one. Maybe to see is to believe. But I have a friend whose name is Marco and tries to tell me stories about ghost but I don't want to listen because I'm afraid it might change my mind and think that ghost really exist. (creepy...)