I'm not astonishingly good at keeping track of complicated human situations. Unless it's very well done (Game of Thrones, but *not* the sequels or the tv shows), I forget who's related to who and what the backstory was.
Obviously, there are people who are much better at such things than I am, but are there any real world events which went wrong because someone in charge simply forgot the details of alliances and enmities?
Two relevant links:
Not very funny, possibly could be improved with dotted lines:
Links thanks to andrewducker
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