Firing spitballs.

Sword fighting with pencils.

none that i remember, except the pok'emon card game fad and drawing on desks

This.

I thought of some other ones.

3rd grade:
Color changing markers
Chinese Jump rope (mostly a girl trend)
drinking 100% juice

Swirlies and wedgies.

thecrow174 wrote :
This.

I remember that! What the heck is it?

shakin steak wrote :

thecrow174 wrote :
This.

I remember that! What the heck is it?

An "S" written in a totally different way.

I know it's an S. Why was that particular different way so popular to scratch into desks/draw on the wall?

Boredom?