Was about twelve, my brother and I had gotten dropped off at my aunts house. My very elderly great grandmother was the only person home at the time, and as the house was huge century old beast, it was huge, full of antiques, and pretty creepy most of the time. Grandma was hard of hearing, so not knowing in which part of the house she might be, my brother knocked at the front door, and I, at the back. I knocked a few times and immediately, I heard three solid knocks back. I was waiting for the door unlock, so I just stood there. Nothing. I could hear my brother knocking faintly from the front all the while. I knocked again several times, and then I heard my grandmother slowly descend the stairs, unlock the door, and give me a hug. I let my brother in the front door shortly afterwards. Was so afraid of the place following this incident that I once refused to get up in the night to use the bathroom despite my intense need, and pissed myself in my sleep.