You just had to google it - didn't you?:)

>>Okay - Okay!
>>
>>NOW: What is the answer to the title in this thread?
>>What do you call the mouse shadow in the second moon?
>>
>I'm not into sci fi other than as a casual observer , but I am a researcher so. . .
>From the script of Dune:
>http://www.unsolvedmysteries.com/usm341500.html
>
>"PAUL (thinking) What do you call the mouse shadow in the second moon? STILGAR We call that one Muad'dib."
>
>Gee, I wish I was back in high school and had access to the internet!