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.