"It would never happen with my wife." It was just something that happened to come up when I was drinking with some friends at a local izakaya. It was an unpleasant joke that my wife might be cheating on me with another man without my knowledge. I played it safe and let it go, but to be honest, I remember being strangely shaken. I thought that since it was my wife, she would just brush it off no matter who the other person was and it would end there.