Interesting debate - great thread nailit :o)
When I was 7 my mum sat me down to tell me that the family dog had been put to sleep - before she even opened her mouth to speak I was distracted by a sharp light and looked out of the window. The sky was suddenly aglow - the most powerful sunset I had ever seen shining straight into my eyes - but the thing i remember vividly was the sound of a female opera singer - singing so loudly, I had to double take and look at my mums lips moving telling me that the dog was gone, but the intense sound was still there for about 20 seconds or so. Whether this was a coping mechanism to deal with the news I don't know, but given the circumstances, I remember the moment both fondly and with sadness. Odd.
My mum told me of when she was a teenager living in a Liverpool terrace. She was about 14, and making tea when her mum came in, looked past her and started having a panic attack staring at the wall behind my mum which joined the next door neighbours. My mum turned round to see what she was looking at and as quickly as she saw a large dark cross on the wall, it disappeared. My mum took my nan out of the house in hysterics and she refused to return until her husband came home. When he did, he didn't believe either of them, and knocked on the next door neighbours house to try and get to the bottom of it, no answer and as unlocked, when he entered the house, found the neighbour had passed away, slumped in his kitchen chair with his head resting on the adjoining wall.
Neither my nan nor my mum were/ are (respectively) in the slightest bit 'batty' nor attention seekers and it remains a mystery to this day exactly why they both saw what they did.
Other than that, I have woken up in the past with the feeling that something is wrong, and a book has then fallen off a shelf - but this has been explained as: you hear the noise first, then wake up believing that you woke up before the noise occurred apparently.
I'd love to see a ghost for the same reason as Ratter - just to know either way.