The Observed Failures slide deck from NASA DASHlink (via many places) is an interesting and even alarming collection of observed failures in hardware and software, mostly avionics related. I find it both entertaining and a useful reminder that all of this digital stuff is really analog underneath and that leads to interesting failure modes . Lest you think that all of these were hardware faults and us software people can be smug, well, not really . There are more; read the whole thing, as they say.