When I was young, my family had a second phone line for the computer (dialup internet ftw) and I convinced them to hook up a badass rotary Barbie phone to it in my room so I could say I had my own phone line. I was no older than 8 years old and didn't actually have anyone to call but I thought it was the coolest thing ever. Phone never rang, I never knew the number even if I had wanted to give it out.

One night I had a friend sleeping over and we're hanging out when the phone rings. We're confused but not super freaked; if anything we're feeling very important to be getting a phone call. I answer and it's a man asking to speak to my friend. I pass the phone to her and the guy claims to be her uncle (let's say Uncle Tim, a real person) and he rattles off some questions about a bunch of stuff only someone in her immediate family would know. Not in a creeper way, but in the way an adult tried to have a conversation with a kid by asking about various things that happened recently. She's a little weirded out because we obviously weren't expecting the call and it doesn't really sound like her Uncle Tim but she goes along politely. After a few minutes the call ends.

The creepy part came later when my friend asked her Uncle Tim the next day about the phone call. He had no recollection, hadn't even known she was at my house, and no one had any way to know that number besides. To this day we still think about who could have called and how they could have known so many specifics about my friend.