Yu-gi-oh cards
-Primary School, we played it so much that they banned it.
Bakugan
-Primary School, we would trade them and someone wanted theres back after a fair trade and then they were banned
Harlem Shake
-High School, recently everyone wanted to make their own but everybody knew how stupid it was and never did it.
Gangnam Style
-High School, about a month after it actually came out they acted like it was brand new and they found it before it was popular.
DragonVale (ios game)
-High School, it was a cool game where you bred dragons and put them on display and they would collect money. It stayed around for about 9 months
Modern Combat 3 (ios game)
-High School, it was pretty much ios call of duty. It was pretty fun but after holidays it became neglected. I have a feeling me getting good at the game put people off. Nobody wants to be beaten by the loser.
Minecraft
-High School, still going. It's popular because people like entering other peoples servers and wrecking shit. Usually the owner makes them invisible though.