I don't know what to think about about thi question. Do ghosts exist? in my world i don't think so. This thoughts are all in the mind, when you think about something, it will obviously manifest in your mind, and as long as you entertain such thoughts, the more they appear to be more real in your life. Who has ever seen a ghost, how do they look like, can you touch them, can you hear them when they walk? maybe you need to ask this questions before you say ghosts are real. I personally think these are spirits, those exist. Spirits can live inside a person and do things that people may not approve of. You can perceive a spirit when it's close to you, someone once told me that they actually felt the presence of someone beside them yet they could not see them. How then can we term that as a spirit or a ghost? i would say a spirit.