I know this question sound silly, but i have my reasons.
Last year, one of my friends said that they had been seeing a man walk around the house. Like a ghost, and it would talk to her, and ask her questions. Sometimes he would repeat what he said. I went over her house to spend the night, and during the night, i saw the man. She thought that it was her imagination the whole time. As time went on, my friend said that the man stopped appearing, and a week after that, we both saw him moving into the house across the street. This happened last week. She went to talk to the man, and he told her that she was a very nice person. I honestly wished i would have taken pictures when this all started.
So, can this happen? I thought that they only travel through the spirit world. Maybe what we witness was a coincidence?