Related Clues:

• Least common
• Most curious
• Adjective for a 'Ripley's Believe It or Not!' feature
• Most unusual
• Superlatively strange
• Least explicable
• Most bizarre
• Most Ripleyesque
• Most peculiar
• Adjective in a “Ripley’s” entry
• Furthest out there
• Most off-the-wall
• Least conventional
• Least expected
• Most strange