Do you ever get lost on wikipedia ?

A penny launcher ? That sound like a weapon. I understand the fun you had

I only shot the teacher once.

Not so abusive then. I used to shot paper bullets on the board whenever the teacher was writting something, hit the teacher quite a few times

Uhh, how did you do that?! With what?

With ink erasers, you cut the two ends. You'll need a smaller stick (we used brushes) to push a small separator located in the middle of the eraser close to one end, which will be the main part to fire the paper bullet with air compression. Then put the cap of a bic ballpoint pen with the top in the eraser on the other side of the separator. Then just take some paper, water it and form a small ball, put it in the cap. And the final step : aim and push hard the separator with the brush, the compression will fire the paper bullet.

Dang, thanks for that type up! Really helpful