I've seen at least one ghost in solid form, a man I was passing on the stairs ran past me, I moved and said something like sorry, only when I came back down, my friend asked who I was talking to on the stairs. I wouldn't of known he was a ghost otherwise.
I once played with a girl in the park and there was only us two children there, my parents and a group of young adults without children, my mum thought it was odd she was completely on her own without parents, she was approx 6-7 years old, we were playing one minute and the next, she vanishes, we are all startled, no where seemingly she could gone without being seen. The creepy thing was she asked me if I'd heard about the car crash that killed a family.
Another one, may not be a ghost(s) but still strange, I once lived in a village, very small, and few shops, not much traffic, most lunchtimes I'd pop to the local shop, it was usually around the same time each day, I was fairly new and people were familiar and said hello on passing, but one lady I noticed used to stand on the side of the road beating dust out of a rug, like they did before hoovers were invented, she also wore a long grey old fashioned dress, we both would look at each other but she didn't smile and would carry on with what she's doing, also outside the local pub, a lady that I assumed worked there would often stand outside in black Edwardian dress, they were completely solid form and during the day, perhaps they were real but just something about it being in the middle of the day, no event going on, sparks the mystery.