On the first day of college, the Dean addressed the students, pointing
  out some of the rules:
  “The female dormitory will be out-of-bounds for all male students, and
  the male dormitory to the female students. Anybody caught breaking
  this rule will be fined $20 the first time.”
  He continued, “Anybody caught breaking this rule the second time will
  be fined $60. Being caught a third time will cost you a fine of $180.
  Are there any questions?”
  At this point, a male student in the crowd inquired: “How much for a
  season pass?”