In my day...... - How old are you?

[Ken'sPen]

spit ball fights........
In the sixth grade everyone made spit ball guns.
take the tube from a bic pen..(tape over the little pin hole if it had one.
put one spit ball in the front and one in the back. then ram the one in the front forward with a wire from a hanger. It created a hell of a lot of air pressure which would send the spit ball in the front flying, WITH a satisfying POP.