And here is the reminder: In a recent case, the Supreme Court of Nebraska disbarred an attorney who entered into a business deal with a client without complying with the requirements of the rules of professional conduct.
According to the court, the case "provides a textbook example of the ethical mine-field that is laid when an attorney enters into a business transaction with clients whose interests are adverse, without providing the full disclosure required by the ethical rules."
The case is called State ex. rel. Counsel for Discipline of the Nebraska Supreme Court v. Chvala, and you can read the opinion here.
Thanks to Bill Freivogel for sending me the update!