This is a really short story, but it's something I have never forgotten. My grandfather (on my father's side) passed away in 1999, during my first week in high school. I was very close with him and his death was definitely a blow. Sometimes it's still hard for me to believe he's really gone. And maybe that's why this happened.
About a year had gone by since my grandfather had passed away and I was sitting in the living room, reading a book. I zone out when I'm reading, so I was pretty startled when a rush of air went into my ear. I looked around and no one was in the house. They were all outside. None of the fans were on and the windows were shut, including the one I was sitting near.
And yes, at first I thought it was a draft. But then I realized that the windows were brand new and there was barely a breeze outside.
I think back to that day and deep in my heart, I believe it was my grandfather letting me know he would always be there. Even if I couldn't see him, I could at least feel his presence.