The Coffin House

Shows like "Ghost Hunters" are my favorite. I love visiting places that have drama and spook to them. A few years ago I was really stuck on going to somewhere "haunted".  I googled the crap out of haunted places in my area.
My best friend at the time, Ryan, and his girlfriend wanted to go on an adventure to said haunted places. As we started on this journey; our hearts beating in time the his rusty engine in pure adrenaline; headed for the place mentioned thousands of times through high school and middle school.
A circular building/farm or something that was haunted. I can't recall the tale of murder or death, but the "round house" was terrifying to my classmates as a result of illegal shooting at the building.  With the slightest breeze, the building would echo a terrifying scream-like noise. To our disappointment, the building had been torn down a few years before.
Ryan enthusiastically suggested the "coffin house". He described the building as old and boarded up, conveniently located beside a cemetery and difficult to enter because of a cop who lived nearby.
Ryan, his girlfriend and I ran up the hill and walked beside a green, garbage filled stream.  (I'm pretty sure the stream was almost a solid mass it was so polluted.)
The house has also been torn down, but the "coffins" remained in a half circle around where the house used to sit. 

Kinda like this; scary right?

These square containers couldn't be longer than five feet and they made of thick grey cement--close to four inches thick.  Many of them had decayed on the corners and you could see inside--if your head didn't block all the light.
Ryan starts looking inside one with his flashlight and he starts yelling, "Oh my gosh guys, I think there's something in this one! It looks like something is scratched on the inside! I can't make out the words. Someone must have scratched in it with fingernails or something.
I am a skeptic, because clearly these weren't coffins. I take his flashlight and get on my knees, peering into the dark cement box where a skeleton should be rotting.
At first I see it too. There seemed to be writing and it kind of seemed to shine in the light of the flashlight. Suddenly this skeleton turned into an alien form leaving a message for us.  I shove the flashlight as far as the decaying cement would let me and I see----DUCT TAPE. 
That's right; my idiotic friend confused the grooves in silver, bent duct tape to be writing from an undead creature.