Last Thursday I opened up our old Sequential Circuits Six-Trak and re-installed the factory patches. I also cleaned 20-odd years of grime off the contacts of the buttons - It works a lot better now.
After that, I opened up an old radio and had fun conjuring free-jazz electronic noise out of the circuit board with my bare hands.
TIP: DO NOT TRY THIS WITH ANYTHING THAT IS PLUGGED INTO THE MAINS !!!!