I have always believed my deceased father has been popping in and out of my house to check up on me. There are multiple signs to show that it is him and no other spirit. And to test this out, I got out a small flashlight from my kitchen's drawer. If you've watched Ghost Hunters, you would know this trick. You take a flashlight that has to be twisted to turn on, and you turn it so that in one more turn it goes on. Then you ask the spirit to turn on the flashlight and when it does you can have a conversation. It's kind of like the Ouija board but not as dangerous.
While my family was upstairs, I took the flashlight to the basement with me and I set it up on the couch. I stepped away and asked if there was someone here to turn on the flashlight. It took some time but after a few minutes it did turn on. I know it wasn't the batteries because I just put fresh ones in. I asked it to turn it off and it slowly started to turn. Once it got the hang of turning the flashlight on and off, I began to ask questions.
I was asking how old it was, if it was male or female, did it have a family, and all the answers reflected my father. So I finally just came out and asked if it was my dad and it said yes. Now I know that you're thinking it's probably not but all the questions came back with the answers my father would say. I even asked personal ones and they came back correct. I asked him if he wanted to say hi to my mom and sister and I took him upstairs, but when I got up there, no one believed me.
After that first time I tried this technique, I showed my friends at their house, but again, it was my dad who answered. Now every time I try it, he is the one who turns it on and off. He told me he knows when I'm going to do it so he follows me and turns it on when I need him too. And just to be safe, I ask him if there's any other ghosts in the room who want to communicate and if there are then he let's them give it a go.