Like others I messed with an ouija when I was very young..each of us asked a question that couldn't possibly have been known by the others, and that person would remove their finger from the glass while asking said question..I don't remember what others asked but my question was answered perfectly correctly...no one else would have had an inkling...we stopped at that point.. scary stuff when you're 13.
Also I have sister who is VERY psychic.. a few of my family were, some not really realising, but she is the only one who has read for people, in many ways, done distance healing, etc..she even described a friend's new house abroad down to the last detail, all perfectly accurate even though she had never seen it or photos of it, in fact didn't even know about it until her friend told her. She even sat next to someone in a bar one night, where she lived in Spain, and was suddenly swamped with information about this person... a tentative chat eventually confirmed all was true. I asked her once how she received all this information and she said it came in the form of voices mostly, but sometimes she would be shown a picture, as in the details of her friends house I suppose. She has a very good reputation, and although she no longer practices much still has people asking for her, many of them strangers who have heard by word of mouth.
I've had my own small experiences that make me believe..no, not a vivid imagination, real inexplicable experiences. It's not science as someone suggested..how would you know unless you are a scientist and can prove your theory... but I've given up trying to convince other people..I appreciate that it takes experience to believe... as the saying goes "To the believer, no evidence is necessary...to the non believer, no evidence is enough"