This took place a long time ago. I'd say I was 11 or 12, so the year was 1971 or 1972 in June. It happened at my friend Wendy's house in Morristown, New Jersey.
My friend had me over for a sleepover. As children, I remember we were always being told things like, "Never go in a graveyard at sunset because that's when the spirits come out." Well, my friend's house is right by a graveyard. We could even see it from her bedroom window that is in the back of her house.
The very next day, we made plans to go in the graveyard at sunset. We invited three other friends to come, too. We entered the graveyard with the idea to find out what the tower in the center of the graveyard was about.
We were about half way to the center of the graveyard. It was getting dark, but still twilight out. All of a sudden, there was a scream that sounded like a woman's scream. I turned around to ask my friends if they heard it -- and they were running for the graveyard gate. I yelled, "Wait for me!"
When I reached the gate, everyone was gone except Wendy. She was outside the gate, holding onto the gate and looking into at the graveyard. I went up to my friend, who was still panting from her run, as was I. When we caught our breath, she said, "Do you see what I see?"
I said, "You mean the dark, shadowy figures moving in and out between the gravestones?"
I said, "Yea, I see them."
Then she said, "Don't ever tell any grown up. They would never believe us."