Scanning around on youtube and ran across this rather interesting video. It shows the inside of a warehouse, there is a worker or two, the worker walks out of the room and the loading cart starts to move on its own. Once the worker returns, the cart stops moving and it appears the worker is a bit freaked out as he sees the cart moving.

But there could be more to this. I noticed a white light just before the cart starts moving.
So, I took just that very small section, and a few still frames, and attempted to enhance this unknown object.
Here are my efforts, what do you think?