A real life Yes Man
This guy:
http://en.wikipedia.org/wiki/Jacob_Holdt
is a danish photographer and writer.
Read about him wikipedia.
Anyway, the point is, at a conference I attended he told his story.
The way he stayed alive and so amazingly avoided getting killed by the numerous murderers, rapists and muggers he met - and lived with! - , was simply to say yes to everything.
He might avoid situations that implied an uncomfortable suggestion, but once the question was out, he would answer yes.
As a hitchhiker, he had sex with many gay men. If driving himself he would take up anyone who wanted a ride, and generally he never turned anyone down.
The result seemed to be that he was never afraid of anything and adopted the world view that everyone basically just needs love. Nobody seemed to want to kill him.