I haven't personally experienced any of this stuff, but DF certainly has. I'm kind of skeptical about it all--I'm not really sure what I believe, but I've been with him when he's asked if I've seen anything. For instance, when he was visiting me at college once, we were walking by the cemetery that the campus has been built around (weird, I know) and told me that someone was holding onto the fence from the inside looking out at us, when it was after dark and the gates were locked and no one was there. There was also the 4th of July last year, when he was visiting me here in the US and we had a party at my house...it was late and we were in the front yard because we had been watching fireworks...we were walking to go back inside when he turned to me and said "something whispered in my ear out there and asked 'am I dead?'"--that was kind of creepy, because there have been 2 car crashes into the huge oak trees in my front yard in my lifetime that left the drivers dead on the scene.
There have been several other times when he's told me that he's seen lights and such, but he always tells me it's just kind of creepy to him rather than scary. However, that seemed to change within the past year. His grandfather passed away this past September, and he's "seen him" since then. Once was when I wasn't there, and he relayed to me by phone that the night before he had seen his grandfather standing in his bedroom doorway watching him and told DF he was proud of him before disappearing. The other time was at Christmas when I was there. We were upstairs in his room when he heard something downstairs (I heard nothing out of the ordinary, but seeing as it's his house, he knows what sounds are normal and which aren't better than I do) and went to check it out while I stayed upstairs watching tv. He was taking an awful long time, so I called for him to come back up and he came back up shaking like a leaf and had turned pale. I asked if everything was alright and he said yes, and I couldn't get out of him until a couple of days later what was wrong. He told me he went downstairs and was about to come back up when he stopped because he heard a voice, and his grandfather was standing in his dining room.
His grandfather hardly in his life visited DF at his house--DF always went across town to visit with him instead.
Creepy.