Absolutely. My older brother passed in May 2009. At Christmas that year - we all went to Florida because no one wanted to celebrate with out him. He was there - I'm sure - because he pushed the christmas tree over.
The following year - I was sitting in my living room during our Christmas get together. For no reason - one ornament came flying off the tree and rolled into the middle of the room. It was my Detroit RedWings ornament - that my brother gave me as a gift.
No one can tell me there aren't ghosts. And - I am happy about it.