Related Clues:

• Wildness
• Caprice
• Cutting-edge
• Furbys, once
• Excessive interest
• In thing
• Excessively intense enthusiasm
• Beatles phenomenon, e.g.
• Cacoëthes
• It's in, for now
• Gossip (with "the")
• Hula hoops, in 1958
• Pet rock, once
• Passing fashion
• Intense obsession