The most famous moment in Brandon Swanson's disappearance lasted less than a second. During a 47-minute phone call with his father, Brandon suddenly exclaimed, "Oh, shit!" Then the conversation ended forever. Investigators have spent years trying to understand what happened in that instant, but the Minnesota Bureau of Criminal Apprehension still lists Brandon as missing.

In this episode of Unsolved and Missing, we examine Brandon's final words, the leading theories about what they may have meant, and why one brief sentence has become the center of one of America's most puzzling disappearances.