The goal of this program form is to write the shortest program that uses up all of the features in a programming language without including dead code. (This would have been a lot easier if dead code is allowed.) An example for this is the following brainfuck program:
,[.-[-->++<]>+], which is a trivial Truth-machine program that does not halt. A golfed variant of this program might be:
Feel free to post another example of this here!