Came home for Chrismas, and my father had retrieved my childhood Apple II+ from the garage. To be careful, I wanted to test the power supply before trying to turn the whole thing on.
I took it outside, attached a 12v lamp across the 12v pins to provide a load, turned it on. I had had time to test the voltage on all the connector pins with a multimeter and it all looked good, but then there was a popping sound and smoke leaked out.
I opened up the power supply to look, and I guess this was the culprit. Unfortunately, it was impolite enough to damage the identifying markings on the case when it exploded. I guess there were a million Apple II+s made and somebody probably knows what kind of device to replace this with, but it's not me.