As I stated in my first story "Voice On Tape", I was going to ask my mom if I could share some of her stories. I asked and she agreed.
This happened to my mom and half sister before I was born. First off, in order to understand just how horrifying this was, I'll have to give a little detail of the land my family has. We live on 85 acres of land. That's just my side of the family. The whole tract of land is divided among other branches of family. In total, there's about 160 acres that we have access to.
My grandparents lived next door and had built a playhouse in their backyard for the grandkids.
It was one night my mom and sister were home by themselves. My sister had a friend over and they asked if they could go play in the playhouse. They were about 13 at the time so my mom said it was fine.
Some time later, my mom guesses around 8:30ish, she was sitting in the living room and out of no where there was this loud god awful laughing. The best way she can describe it is to imagine the most evil witch's cackle you can imagine and times that by three. She said it sounded like it was in the room with her.
The next thing she knew she hears my sister and her friend screaming at the top of their lungs and in they barged, faces pale and scared. Asking them what's wrong they proceed to tell her that they were in the playhouse and suddenly they heard this evil laughing inside with them.
This is where describing the land is important. The playhouse is about 50 yards from my parents house, so how could both my mom and my sister and friend have heard the laughter as if it were in the same rooms as them, when they were so far apart?
To this day mom doesn't like telling the story but she will. It's been 32 years and neither my mom or sister have changed the story in the slightest. The conviction when they tell is also still very strong.
I'd also like to point out that it's been confirmed that the Congaree Natives in fact lived on that land. We've found arrow heads and pottery shards in the woods as well. So it makes you wonder, is that the reason behind all the paranormal stuff that happens at my parents house?
As stated by some commenters here, it could be some sort of a wild animal, since lots of animal species can mimic human sounds or have sounds that are mistaken for human.
Ok,for the arrowheads part, your place is probably a former battlefield, I concluded that the sound you heard, if it was truly paranormal, was that of a lost spirit who died a violent death.