3D Vector Graphics on an Oscilloscope
I was writing software to control a ramp card that will used at Fermilab. The hardware can generate four, high-resolution waveforms. I realized that, by using the 'scope's X-Y mode, I could "draw" stuff by using two channels. This is a rotating cube on an oscilloscope.
It's quality is lousy because it was a spur of the moment recording done on a flip phone.