I wish I’d copied it, but once a co-worker in sales had an out of office that was long and rambling and talked about how she and her family were “going to visit Mickey.” I didn’t know what to make of it, especially since it could go to prospective clients.
Given free rein, I’d absolutely love to tell people that needing me to show them how to do X in Excel is actually not a vacation-interrupting emergency and there are tons of free videos that would explain that, if they did not want to contact the actual departments who handle tech support and training. Or that this project they’ve known about for a month but decided to keep under their hat until it became an emergency is something they’ll need to resolve themselves. But that would not fly at all.

Oh man, I mostly loved my European colleagues, but the “we were gone for a month, why haven’t you done more?” made me so, so stabby. That or the whole “hey, you really need to work harder to get this done by June 25th because none of us are going to be around to take care of our part by July 1.” So, I’m working 65 hour weeks for a month so you don’t have to spend 8 hours of your vacation working? Sounds fair.
Leaving an email without a responder can appear unprofessional, lose potential business and, worst of all, make you look like Scrooge!