Come on, really? Did you ever have a piece of code that should be impossible to reach under normal conditions? Did you put a message there to remind yourself t

Come on, really? Did you ever have a piece of code that should be impossible to reach under normal conditions? Did you put a message there to remind yourself that the case in question should never, ever occur? That could be a unicorn. For extra credit, if you have put these messages in your code, have you seen all of them at one time or another? I certainly have!