1. WHILE installing System Software (I believe 7.5 and before)
2. After the last disk (or Folder) has been read
3. But before "Finishing install..." shows up
4. Hold down OPTION & COMMAND keys and keep them down
5. When the text says "Settng Correct Desktop Pattern..."
6. A secret about box will open.
7. (May not work on newer install scripts)
8. (different for different software versions)