Pyrotechnics

Cool, I was building a PC out of spare parts, and it blew up.  It was sitting there at the Windows 2003 Server setup screen (some people might argue that was my problem) and all of a sudden there was a loud bang and crackling noise.  The circuit breaker tripped, and the room filled up with smoke.

I still haven't plugged anything back in yet, so I don't know if it was the monitor or the power supply on the PC.  My guess is the monitor; I haven't used it in a few years, and it's been sitting on the floor of a damp basement...