In a decision that the Seventh Circuit issued on February 7, Chief Judge Easterbrook uses the occasion of a frivolous appeal from a district court’s judgment enforcing an arbitration clause to make a jurisdictional point and a procedural point. The failure of the winning lawyers to understand the first point nearly cost their client its lower court victory, and their failure to understand the second point did cost it an award of costs on appeal. There are lessons to be learned here.