https://www.popsci.com/story/science/ghosts-real-science/
Someone had to say it. But seriously science cannot disprove it, but regardless of that point, the rest of his points are coming from a skeptic, that is scared of things bumping in the night, and the teddy bear thing.
Sure l have seen plenty, including my 10 year deceased, Grandmother, and that wasn't swamp gas, a mental disorder, lights, aliens or cockroaches.