http://www.b3ta.com/links/Oscilloscope_demo Pretty cool demo. An Oscilloscope is basically a CRT with Z control on the beam as well as X and Y, but the melting stuff is amazing.
"It's bit late and off-topic, but anyway, if you haven't seen it yet... here is a cool use for your oscilloscope: use it as a display for a demo. This demo won the third place in Assembly Summer '07 shortfilm competition. I really like those sine waves. By the way, the guy who made this is 15 years old. The oscilloscope is connected to PC soundcard and is in X/Y-mode, with right channel connected to X and left to Y input. Download its waveform from here to see it on your oscilloscope!" Found here: http://www.makezine.com/blog/archive/2007/08/youscope_oscilloscope_dem.html