What fad from your childhood/teenage years used to be "in" but now has vanished?

Pocket knives.

Carried in your trouser pockets at home and school and used to whittle, carve names in trees. Essential for a well known game called 'splits' where you stood facing your opponent and threw your knife to stick in the ground. He would have to reach it by moving one foot, not falling over etc. etc.
 
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