Those of us who've been programming the Mac for a few years have some fond memories of the old Macintosh Programmer's Workbench (MPW). It was very much like the Terminal Window on OS X, but had a few quirks of its own.
Among those quirks were the error messages that the C compiler would give you for certain errors. Messages like, "a typedef name was a complete surprise to me at this point in your program," and "String literal too long (I let you have 512 characters, that's 3 more than ANSI said I should)" almost made you want to write broken code just to see what the compiler had to say.
The most complete list of the error messages I could find is here.
Well, rumor has it that there's a skunk works at Apple who are busy porting some of these error messages into XCode 2.0. And they say that Apple have lost their sense of humor...
Currently playing in iTunes: Won't Get Fooled Again by The Who