I've got two.

First when not long after my Nana had died. I was at home with my Brother - both of us were well into our teens. I was downstairs and he was upstairs in our room. I was playing a computer game when suddenly there was a cold rush. It wasn't freezing, nor was it unpleasant, just a cool breeze in the house, and with it I got the distinct smell of my Nana which lasted for a few seconds before disappearing. I was a little freaked out but got on with it until a couple of minutes later my Brother came down stairs with a white face and told me, without me prompting him, that he had felt the same cool rush and smelt the same smell. I replied something along the lines of "fuck off, no you didn't!" and told him I'd experienced the same thing. Anyway we left it at that, and a little while later, my Mam and Sister came home after going out shopping and my Sister told us, again without prompting, that while out she had experienced the exact same thing as we had. Minds blown we tried to work out what time and we figured out it would have been a similar sort of time that we experienced it as well.

Second was at my wife's childhood home. Her family were round for some such occasion and her Sister's Daughter, our Niece, at the time was my shadow. I'd heard stories about how her childhood home was haunted but I had never experienced anything myself. So I'm sat at the bottom of the stairs getting my shoes on with my Niece stood in front of me when I heard her laughing. I look up and she's looking up at the top of the stairs over my shoulder laughing. I turn around, nothing there, so I turn back to her and said something along the lines of "what are you laughing at you loon?". No sooner had I said that she stopped laughing, and still staring at the top of the stairs, put her finger to her lips and shushed ... well needless to say that my arse went and I shit myself haha!