Obsessions

I remember when a peer/friend/classmate a few years ago presented a speech about obsessions - about how it's healthy to be obsessed with something, like grass (the lawn kind), or Jane Austen, or tennis.
It is interesting to see the development of obsessions through the eras.
14th Century, it was spices and sea-faring and discoveries.
17th-18th Century it was Bach's creations the new phenomenon of Mozart and horse carriages.
19th Century it was taking over other countries and naming them New Zealand.
20th Century... *and I rub my hands in anticipation*
Bell-bottoms? Afros?
Discos? Platforms?
Skateboards? Bermuda shorts?
Beatles? Backward caps?
Scrap-booking? Stamp-collecting?
Sailor Moon? Will Smith?
Spice Girls? Marbles?
Walkmans? Sneakers?
Smurfs? Harry Potter?
Lord of the Rings? Wearing layers?
Shoulder-sling bags? Fluffy pencil cases?

And then the new Millennium:
Side fringes? Paper thin laptops?
Scoubies? Chucks?
Twilight? Plaid?
Smiggle? Skinny jeans?
Lolcats? Abbreviations?
...

and do, if you have any ideas/suggestions,
Comment and add to the list.
I'm still collecting.