I always put the apostrophe in “ain’t” to make certain I’m using proper improper English. – Author unknown

There is no element in which language resembles music more than in the punctuation marks…. Exclamation points are like silent cymbal clashes, question marks like musical upbeats, colons dominant seventh chords… – Theodor W. Adorno (1903–1969), “Punctuation Marks,” Notes to Literature, V

There are people who embrace the Oxford comma and people who don’t, and I’ll just say this: never get between these people when drink has been taken. – Lynne Truss, Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation

The writer who neglects punctuation, or mispunctuates, is liable to be misunderstood for the want of merely a comma, it often occurs that an axiom appears a paradox, or that a sarcasm is converted into a sermonoid. – Edgar Allan Poe