One product I worked on a number of years ago had a CantHappen() function with a simple implementation. It displayed this message box: You are not here. Ano

One product I worked on a number of years ago had a CantHappen() function with a simple implementation. It displayed this message box: You are not here. Another message was in the Mac installer when there wasn't room to install: Your hard disk is too small. That's the complete text of both messages, and yes, it displayed them to the customer. <sigh> After seeing these, I started going through the code and found a bunch of other rude, confusing, or jargony messages. It actually turned into a fun little project cleaning these up!