It is a cool use for your oscilloscope: use it as a display for a demo. The oscilloscope is connected to PC soundcard and is in X/Y-mode (Z -brightness input is not used.), with right channel connected to X and left to Y input. Download its waveform from link below to see it on your oscilloscope! The soundcard is not modified: oscilloscope’s input impedance is so high that the DC blocking capacitors don’t highpass the signal very much.
Youscope (oscilloscope demo)