Related Clues:

• Inventor's starting point
• Part of a Charlie Brown catchphrase
• ''Why, the very ---!''
• Misery
• It's all in your mind
• Bee Gees album title
• Inventor's need
• Hypothesis
• Brainstorming bit
• Cerebral creation
• Think tank output
• Heartache
• Mental picture
• Mental flash
• 'What's the ___?!'