Suppose a sealed note is mistakenly placed in your office mailbox. You open it and start reading before you realize it is addressed to your coworker Brad, who is married with three kids. It is a passionate message from a lover in another division of the company with whom Brad is having an affair. They evidently exchange love notes through company mail. Is it OK, or even obligatory, to inform his wife about this? Don't just say, "Of course not, it's none of my business." Provide an argument based on the conditions for rational choice.