500 Keys
- Episode aired May 15, 2011
- TV-14
- 30m
While Homer takes the Duff Blimp for a joyride, Lisa discovers a secret room in the basement of Sprinfield Elementary School.While Homer takes the Duff Blimp for a joyride, Lisa discovers a secret room in the basement of Sprinfield Elementary School.While Homer takes the Duff Blimp for a joyride, Lisa discovers a secret room in the basement of Sprinfield Elementary School.