A 2019 YouGov survey says that 20 percent of American adults "definitely" believe in ghosts; another twenty-five percent believe they "probably exist."
And, while no data yet proves it, there's a good chance that quarantining at home during the pandemic has led more people to wonder where those nighttime creaks and groans are coming from.
Some skeptics say that seeing ghosts is part of the human experience and far too common an occurrence for everyone who thinks they see a ghost to be crazy. But there are a lot of reasons to explain why we sincerely believe we're seeing a ghost. Yet, it's hard to convince people otherwise - even when confronted with evidence to the contrary.
In the end, psychologists can offer explanations but no one can definitively prove ghosts don't exist.