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?"