Where have you been all my life, the Interrobang‽ Less so, the Asterism, despite the awesome name. How many of these did you know already? Be honest.
This ad for The White Grotto, found in a 1916 issue of Froth (now Phroth) humor magazine, highlights the importance of proper comma usage. If you still don't get it after the first sentence, you've read too far.