Well this time I wasn't alone

I've expierenced this sort of things a lot of times (mostly when I'm alone), sometimes it's an evil presence and sometimes it's a comfortable presence, but most of the time it's just a curious wandering spirit, neutral...
One time I was really sad and I was crying and I suddenly felt someone putting a hand on my shoulder, but it didn't feel... material, if you know what I mean. Suddenly I saw a picture before my eyes of my grandpa whom passed away several years ago and it felt like he really was there to support me in that dark hour.
