The Dangerous stranger is a variation of the stranger where you sit on both hands. Once both hands are numb beat off with one hand whilst asphyxiating yourself with the other. This creates the feeling that someone is beating you off while choking you out.
Bill "Man last night I got really schwasted, I think I gave myself a Dangerous Stranger theres marks on my neck and dick."
John "Thats fucked up dude, you need therapy"