If you ride on the wrong side so you can jump out of the way in front of a car to survive, some drivers will expect you to do exactly that. This is a game much more dangerous than vehicular cycling.

Edit: also, don't expect other cyclists to endanger themselves by swerving into overtaking cars for an against the flow rider. They might even consciously chose a good head-butt with the other rider over ending under a car. In other words: you should be _really_ ready to jump.