Related Clues:

• They're fleeting
• Planking and pogoing, e.g
• Short-lived trends
• Rubik's Cube and troll dolls, once
• They're in for a bit
• Hula Hoop et al
• They're in one year and out the other
• They don't stay hot for long
• They're only in for a while
• The Macarena, pet rocks, etc
• They pass
• Go-go boots and granny glasses
• Musical crazes
• Pokemon Go and the like
• Short-term moneymakers