My parents were out one night and my brother and I were home alone. We were probably 12 and 10, respectively. Anyway, there's a knock at the door and I hear a voice say "Pizza." Initially thinking it was my father playing a joke I instinctively went to open the door when it hit me...
That wasn't my dad's voice.
"We didn't order any pizza" I said. There was no reply and no audible movement. I went to my bathroom window which allows some vision of the footpath leading from the front of our property to the front door but you can't see the door itself. So we waited for about 15 minutes clutching a cricket bat and some ornamental fireplace poker until finally the dude moves away from the door and walks away.
Just some guy with dark hair in a long ponytail, a long dark coat and no pizza.
edit: changed some nouns for clarity