Related Clues:

• Frenzies
• Rages
• Short-lived crazes
• Fads
• Crazes
• Pokémon and pet rocks, e.g.
• Pokémon and the Beatles, once
• Intense fads
• Pet Rocks and Beanie Babies, etc., once
• Fads, essentially
• They tend to be short-lived
• Wild excitements
• Bieber Fever and the like
• Obsessions
• Is he one, as they're all mad?