Furbys and yo-yos, once

• Crazes
• Fevers that quickly cool
• Widespread rages
• They're all the rage
• PokГ©mon and pet rocks, e.g.
• Fads, essentially
• Short-lived crazes
• Pokémon and the Beatles, once
• They come and go

Wiktionary Word definitions in Wiktionary
n. (plural of mania English)