Related Clues:

• Crosswords, in the 1920s
• The limbo, in the early 1960s, e.g
• Flash mobs, once
• It's a fashion to speak of criminals
• Beatle ending
• Pet Rock or Hula Hoop
• Ice Bucket Challenge, in 2014
• Suffix with Bieber
• Phone-booth stuffing, e.g
• The latest thing notorious 16 announced
• Fidget spinners, for one
• Obsession, as with a pop star
• Fidget spinners, these days
• Vogue thing
• End up suppressing an example of mental illness