In the course of robbing a convenience store, a man restrains a 17-year-old clerk. Suppose the parties work out a plea to second-degree kidnapping. Everything is fine until the judge advises the defendant of the maximum permissible punishment for his Class E crime: 136 months. “136 months?” his lawyer said, puzzled. “I thought it would be 88.” “It would be,” the court replied, “if this crime didn’t require registration as a sex offender.”