I've never had any sort of experience with ghosts etc. but several family members and friends (past and present) say they have had "strange things happen" or "seen 'something'". Of course I can't say they really haven't but I'm skeptical. Even if I were to see something, I'd STILL be skeptical of the majority of claims I've heard. People just are too willing to categorize something they're not sure of as supernatural.
My grandmother (mother's side) who died long before I was born, was told by a spiritist when she was young that she "had the gift" to communicate with spirits. This happened in a little town in Louisiana called Transylvania (it really does exist) - I just love that part of the story!
Anyways, after some time of trying to communicate with spirits she apparently began to have success at making tables 'talk' or rise and tap out messages etc. One day, one of their neighbors who doubted my grandmother's ability came over and wanted to sit on one end of the table while she made the table talk from the other end. Now I've always heard that this was a very heavy oak table, my grandmother was not very big and the neighbor weighed close to 300 lbs. The neighbor sat on the table, my grandmother put her hands on the table, the table rose, the neighbor bolted out the door never to step foot back in that house and my grandmother gave up her practices not long after - deciding that her gift was not from god.