IMO error messages should be as short and precise as possible (the typical user doesn't read past the word "error" before phoning support), with the option of not having them translated (this makes researching a particular error message online much easier). Please leave out "contact so-and-so" crap, because it leads to people excessively contacting that particular person for shit they could easily fix by themselves.

Yes.

"I've been a bad bot. Spank me!"

As long as it's not "oops, something went wrong"

I hate "oops".

{Friendly error message sentence}

{Appropriate code for developer debugging}

[Take a Screenshot Button]

In a perfect world, anyway