You want to hear a racket?
5th grade, friend and I colored on #2 pencils for $0.05-$0.10 based on the size of distance between the wood part and the lead.
Every time they sharpened the pencils, the color went away! and they paid to get it repainted...
Note got sent home, congratulating our entrepreneurship, but to cease and desist immediately because a school isn't a marketplace..
...and that's how it all started