Related Clues:

• More than eccentric
• Around the bend
• Berserk
• Spanish bananas?
• More than a little off
• Making no sense
• Like Jerry Lewis's professor
• Wacky as can be
• Like a professor played by Jerry Lewis
• Plumb __
• Meshuga
• Plain crazy
• "The __ Professor"
• Train puller
• Like some chocolate bars