Another possibility is that it's a cursed object. For example, an old chest that has some dark magic in it. Every time the magic stirs, perhaps trying to break free, it causes the chest to thump thump against the floor or the wall where it's stored.
Maybe it's the ghost trying to communicate. In many ghost stories, ghosts make noises to get the attention of the living. The thump thump thump could be a form of Morse code - like message from the spirit world, but in a more primitive and spooky way.
Maybe it's a ghostly figure that appears and disappears. The 'thump thump' could be the sound of it manifesting and the 'slide' could be how it moves across the floor or ground in a spooky, ethereal way. Picture an old cemetery at midnight, and someone hears this sound and feels a chill run down their spine.
Once upon a time, in an old, creaky house, there was a strange noise at night. 'Thump thump slide.' It was as if something heavy was moving in the attic. A young girl, alone in the house, was terrified. She slowly made her way to the attic stairs. As she climbed, the 'thump thump slide' got louder. When she finally reached the attic, she saw a dark figure slithering across the floor. She screamed and ran out of the house, never to return again.
Once upon a time, in an old, creaky house, there was a strange thump thump sound at midnight. A young girl was staying there alone. Every night, the thump thump got louder. One night, she decided to follow the sound. It led her to the attic. There, she saw a shadowy figure. She quickly ran back to her room, but the thump thump followed her. She hid under the covers, trembling with fear. She never knew what that figure was, and the thump thump haunted her every night from then on.
There was this abandoned mansion where people often heard a thump thump thump. Rumors had it that it was a ghost of a former owner. A group of friends dared one another to spend a night there. As soon as they entered, the thumping started. They huddled together in fear. Then, a cold wind blew through the rooms. They saw a shadow moving on the wall. They all screamed and fled as fast as they could.
It could be a spirit that is bound to a certain place. The 'thump thump drag' might be the way it moves in the physical world. Maybe it was a victim of a violent death, and its spirit is still reenacting its last moments. So, it moves with a limping motion, creating that 'thump thump drag' sound as it haunts the area.
Perhaps it's a ghost tied to a certain place. The ghost might be repeating an action from its past life, like carrying a heavy object and dropping it over and over, which results in the thumpety thump. For example, if the ghost was a miner in its past life and it's now in the old mine shaft where it used to work, the sound could be it dropping its pickaxe in a never - ending loop.
Once upon a time, in an old, dilapidated mansion, a young girl was exploring alone. She heard a 'thump thump drag' coming from the attic. As she slowly climbed the creaky stairs, the sound grew louder. When she reached the attic, she saw a dark figure with a limp, making that 'thump thump drag' sound as it moved towards her. She tried to run but was frozen in fear.
Well, it could be a story where the 'thumpity thump' sound is a warning. Maybe there's a cursed object in a small town, and whenever someone gets too close to it, they start hearing this 'thumpity thump' sound. The sound gets louder and louder as the person gets closer to the object, and then all sorts of scary things start to happen. It could be that the object has the power to open a portal to a terrifying otherworld, and the 'thumpity thump' is like the countdown to this portal opening.
Once upon a time, in an old, creaky house, there was a strange thumpety thump sound that came from the attic at midnight. A young girl named Lily lived there. One night, she heard the thumpety thump getting louder. She slowly climbed the stairs to the attic. As she opened the attic door, a cold wind blew past her. In the dim light, she saw a shadowy figure that seemed to be pounding on an old trunk, making that thumpety thump sound. She screamed and ran back downstairs, never daring to go back up again.