You’re never too old to learn something new. For example, I only just learned that this punctuation mark :— (a colon followed by a dash or hyphen) is known by typographers and other people who have a sense of humour as “the dog’s bollocks”.
Really?
Really.
If you take a good look at it, I don’t need to tell you why, because the physical similarities between the mark and a certain anatomical appendage not limited to canines is quite apparent.
It’s an archaic bit of punctuation once used to indicate a pause, hopefully a tantalising, teasing one, before you go on to cite items in a list. Nobody uses it anymore because meh.
But it’s good to know that generations preceding ours enjoyed the pleasure of inserting a naughty emoticon into their writing, isn’t it?