This isn't my ghost story to tell but it is pretty creepy none the less. I have a friend whose husband bought an old car. Picture a mid-70's mustang. It was in decent shape but he wanted to fix it up. It sat in their garage for a long time. The whole time their kids were saying that they kept seeing 'angry people' around the car when no one was there. At different times the kids would ask who the strange man or angry woman who were sitting in the car. No one was there. The kids wouldn't go in the garage alone and there was just a creepy feeling in the garage once the car arrived. Also, sometimes when the family was away for a bit, when they came back, the dog would be freaked out. Acting all submissive and tail under and the whole bit. Not all the time, just sometimes. When it happened they couldn't get the dog to go into the garage for anything.
So she posted a picture of the car with a For Sale sign. I don't know if she sold it or not, but could not wait to get rid of the thing!
**and I hope if she ever runs across this story, she forgives me for telling her tale!**