Yes, it is a bit hard to think of interesting ones. I did this exercise once in a mixed discipline class - it was easy to think of things with a mechanical/civil engineering theme (titanic/hindenburg/comet/chernobyl etc), but not so much electronics. I ended up doing the 1998 Auckland power crisis, but even that is more power engineering really.
If you don't mind a more software engineering/project management slant, there are plenty of cautionary tales - e.g. the Therac 25, or the Denver Airport baggage handling system. Or possibly you might be able to study something like a railway accident caused by a signalling system failure. (There is a site somewhere with an archive of reports into railway accidents, though its URL escapes me at present.)