Here's one for you...
A client of me reported URL's not working on a partial RU/EN website. So i started to investigate, could not hack it. I requested the help of a colleague - nothing either. We figured that the front-end of the website was just working fine; everything in check and nothing out of order, it just was not working as it should.
So i stumble on the idea that a Russian locale language file on the server might be missing. Strange, since the website used to work for months before that with no change. So i contact the software provider that i have a license on, i explain the situation, and within 15 minutes they reply me with Oh you can install the RU locale file.
Little they know is that my server manager attempted to (re)install the RU locale file; which was not available at that very moment. Only when the support responded, suddenly it was available.
Now that we dug deeper into the situation, it seems that the cause was Directadmin, that revoked RU locale files in a update with no notification or whatsoever. Honestly i'm getting tired of these russian sanctions. My own goverment is not going to compensate me a good client. So as long as that not happens, i refuse to give in in doing what they want.