I share Malc's obsession with punctuation in a punchline. As I've admitted before, I can spend ridiculous amounts of time trying to decide if a joke is funnier with an exclamation mark or a full stop. I also work at getting the rhythm of a punchline right. It has to read smoothly and have the right tempo. Sometimes an extra syllable or two can spoil a gag.
mince, Is usually. Quick too pickup on bad, punctuation and speling.