This happened in a town called Bloemfontein when I was 17years old. Now since I was little I saw a few things before, but this one is the most interesting one.
It was on a Friday night just before 12. My friend, boyfriend and I were watching WWF wrestling (was a big fan at that stage). After a while of watching I fell asleep on my boyfriend's lap. I woke up to my friends grandfather calling out to him saying "Leon remember to check if the front and back doors is locked". He then turned to my friend's mom who was busy in the kitchen doing the dishes telling her the same thing. I looked at my friend and saw that he was not even looking at his grandfather nevertheless listening to what he was saying, I said out loud "yes sir I'll make sure he checks it" (I was raised to look at older people when they speak to you so him not even tuning his head or answering his grandpa was very disrespectful to me.) Both my boyfriend and my friend nearly broke their necks to look at me. They looked at me as if I was crazy. Turning back to my friend I told him that was very disrespectful not to answer your grandpa.
My friend looked at me with disbelief and asked me "what did you just say?" So I told him "your grandpa asked you to check if all the doors are locked and since you ignored him, I told him I'd make sure you would check the doors." He then asked me what this man looked like, by that time with them looking at me like I was crazy and him asking me such a stupid question, I told him he walked with a crutch, had big thick glasses and his hair is combed to the side. I even told him what his pajamas looked like. Leon took a picture off a table and asked me is this the man I saw. Very annoyed at that stage I said yes. He told me that that was his grandfather (thinking to myself duhhh that's what I said) who died 3 months ago in the house. I was speechless and felt like someone knocked the wind out of my body. Standing there speechless he told me that his grandfather always came out of his room and told them every single night to check if all the doors were locked.
He wanted to tell his mom since she believed in stuff like that but I made him not tell her while I was still in the house. The thing that freaked me out the most is that I saw him looking like a real person hearing him perfectly. I think he still looks out for his family even though he is not there anymore.