This video is a perfect illustration of a disembodied spirit of a gangster that hopped into this boy while he was under anaesthetic. Steve explains that when a person takes drugs they open wormholes to other dimensions. As a result the interference from those dimensions have the right to enter the person’s body. Hence when you see people on drugs or severely drunk, they act unusually. In cases like this spirits can still hop into bodies, along with other inter dimensional interference.
Anaesthesia, on the other hand leaves the body vulnerable as vacant possession for any spirits lurking about. Plenty of those in hospitals!