The current generation has gone through the fads of planking (previously 1 and 2), cone-ing (previously), owling, leisure diving (both previously), and even Tebowing (previously). Posing-for-pictures fads are not a new thing, though. In 1959, near the end of the relatively well-known phone booth stuffing craze, there was hunkering.
Vampires are over, argues Neil Gaiman. (Via the Guardian, who rather oddly suggest the similarly over-exposed zombies as a replacement)
The hippest of today's French youth can't get enough of Tecktonik--a dance (YT), cultural movement and apparent marketing ploy (in French), Tecktonic is a style of dance characterized by its lack of footwork and embrace of various ridiculous arm gestures. Coupled with a strong fashion sense (in French) involving copious amounts of neon, pseudo (or full-on) mullet haircuts and jeans that could be painted on, Tecktonik is a dance craze that, since its birth in 2000 at a Parisian nightclub, has only increased in popularity. [more inside]
Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, and one by one
Extraordinary Popular Delusions And The Madness Of Crowds, Charles McKay's 1841 classic work on mass hysteria and national crazes, still surprisingly readable and engaging. Among the classic examples in McKay's book are the South Sea Bubble, one of the earliest and largest financial bubbles, and the witch hunts of Europe (related: try the 1628 Witch Hunt simulation). Most people remember him best for his history of Tulipmania, the Dutch flower-speculation explosion of 1647 and 1648... except that it may not have been a delusion at all, but rather a rational response to changes in regulation.