These are some of the error messages produced by Apple's MPW C compiler. 
These are all real. (If you must know I was bored one afternoon and 
decompiled the String resources for the compiler.) The compiler is 324k in 
size so these are just an excerpt. 

"String literal too long (I let you have 512 characters, that's 3 more 
than ANSI said I should)" 

"...And the lord said, 'lo, there shall only be case or default labels 
inside a switch statement'" 

"a typedef name was a complete surprise to me at this point in your 
program" 

"'Volatile' and 'Register' are not miscible" 

"You can't modify a constant, float upstream, win an argument with the 
IRS, or satisfy this compiler" 

"This struct already has a perfectly good definition" 

"type in (cast) must be scalar; ANSI 3.3.4; page 39, lines 10-11 (I know 
you don't care, I'm just trying to annoy you)" 

"Can't cast a void type to type void (because the ANSI spec. says so, 
that's why)" 

"Huh ?" 

"can't go mucking with a 'void *'" 

"we already did this function" 

"This label is the target of a goto from outside of the block containing 
this label AND this block has an automatic variable with an initializer AND 
your window wasn't wide enough to read this whole error message" 

"Call me paranoid but finding '/*' inside this comment makes me suspicious" 

"Too many errors on one line (make fewer)" 

"Symbol table full - fatal heap error; please go buy a RAM upgrade from 
your local Apple dealer"