My friend wrote a fractal generator on my touch screen el-9650 back in 01
I use to zoom up onto a quadrant of the Cartesian plane, draw pics n save them of a tank blowing up the English department over about 10 slides n use the language to show pic-i for x seconds then go to next one.
Or better yet, I wrote some slides that replicated the 'reset' process so teacher thought all my formulas were wiped.
Haha!