(Video) ‘Possessed’ walking ladder at Changi?

A VIRAL Whatsapp video shows a ladder walking down a carpark slope. An accompanying message claims that the ladder is possessed and the Changi Airport's Terminal 4 construction site is haunted.
It also claims that the patrolling security officer has resigned, suggesting that he was scared out of his wits. The video has also gone viral on Twitter and YouTube.
However, the same video was uploaded 11 months ago in Indonesia. There was also a repost on YouTube, saying the video was shot in Surabaya, Indonesia.
Several days after the so-called haunted Changi walking ladder went viral, another bizarre video footage of a similar incident surfaced.
In fact, a search on the Internet reveals many walking ladder videos. There is a simple explanation for this. It is simple robotics and physics.
A simple motor can be attached to the ladder to make it lift its four legs in sequence to simulate walking. Once it has gained momentum, walking down a slope is a breeze due to gravitational pull.
Watch the video here: