There is an old anecdote about this kind of situation; Postman (P), Recipient ®:
R: what are you doing? P: I left a notice that I tried delivering a package and you weren’t home. R: But I clearly was! P: <shrugs> R: <bashes postman’s face in> P: WTF, MAN!? R: It wasn’t me, I wasn’t home.
This is the right answer imo. While it might be an overkill for sth like 404s, it’s amazing for describing different bad requests.