I've never hurt myself, but I have set the computer on fire. Context: building an avionics test set with an integrated loads and measurements capability and co

I've never hurt myself, but I have set the computer on fire. Context: building an avionics test set with an integrated loads and measurements capability and complex relay switching network to allow different things to be switched to different loads and voltage drops measured. During software/hardware integration testing (first time that the hardware had been driven full speed) we found a bug in the CPLD that resulted in 28V being sunk into a 2A resistive load over a couple of PCB traces specified for 10mA; resulting in a large amount of magic smoke being emitted.