“Hey Mangetout, here’s an invoice for your department; what have you been buying this time?”
Except that it isn’t an invoice at all, it’s just a junk mail advert that looks exactly like an invoice; I’ve never bought anything from this company and indeed the service they are advertising is largely illusory.
Lame rant, sorry, but I really hate this sort of thing; I’ve had these in the past from legitimate companies (in one case, an IT supplies company that I had actually bought from in the past) hoping that I’ll buy a genuine product if they send me an unsolicited pro-forma invoice that just happens to forget to mention that it is pro-forma.
Advertising folks please note; this is a shoddy trick and not only will I not fall for this particular trick, it will actually result in permanent loss of my custom.