(Jobber author here.) It's...interesting that this is the aspect that has gotten the most discussion so far. But thank you, jacquesm et al., for your feedback. I certainly don't want this to turn people away from Jobber, so I'll change it. Computers are frustrating enough; we don't need to add more aggravation!
On the other hand, IMO, the biggest profanity you can put in an error message is an error code and nothing more. Now THAT is how to mistreat your users!
I wonder if there were similar discussions about the insults sudo gives you on OpenBSD (http://prefetch.net/blog/index.php/2012/08/01/sudo-insults-w...)...