What is a malevolent spirit or ghost?

ghosts don't exist. and if you think you believe in them, answer this question truthfully: you've been hearing human noises in your house when you're all alone. occasionally, you've seen things you can't explain in your house. one morning you lay money on top of the dresser in your bedroom. you don't go back in the room until bedtime that night. the money's gone. you hunt for the money and you can't find it. you have a wife and three kids. did a ghost take your money and hide it from you or did one of your family members take it?

or this scenario: one of your co-workers is consistently late for work and has excessive absences with no doctors' excuses or family emergencies. you and the other people in your group have to do his work whenever he's late or absent. He tells everyone in the group that his house is haunted and that the ghost repeatedly unplugs and resets the time on all the time pieces in his house and his vehicles. do you believe him?