What became so popular at your school that the teachers had to ban it?

Plastic "clicker" frogs.

For a class project in Jr. high, my group had to bring a "gift" for each student that aligned somehow with your presentation.

We went to a local party store and found these cheap plastic frogs that had a little metal lever that would make a loud clicking sound when you pressed it. We bought like 200 of the things since they were like 2 cents each.

Took them to school, handed them out to the class, and within 5 minutes the teacher was trying to gather them up and take them away. The click noise was pretty annoying and since everyone had one it was hard for her to figure out who kept clicking theirs.

We all handed out the rest of them from our lockers after class to people that asked us about them, ran out in about 2 days.

The clicker frogs were EVERYWHERE. In Gym, at lunch, in any class, in the bus before/after school, some kids would get hall passes and click them outside their friends classes, and everyone wanted one. This lasted for maybe a week, then the principle over her normal morning announcements said that anyone caught with them would be put in detention.

Clicker frogs suddenly became a black market item, and everyone still wanted one. We bought more, and sold them for $1 each for about a month before we got caught and had detention during lunch for 2 months. Worth it.

/r/AskReddit Thread