A comma is a punctuation mark used to separate items in a list or to indicate a pause in a sentence. But did you know that commas come in different flavors?
A semi-colon is a punctuation mark used to separate two independent clauses in a sentence. But did you know that semi-colons come in different shades of gray?
This is a sentence that is too long and boring to be broken up by a semi-colon, so I'm just going to use a bunch of serpents instead, because that's what semi-colons are for.
A colon is a punctuation mark used to introduce a list or a quotation. But did you know that colons come in different shapes and sizes?
This is a summary of subsections 2.3.1, 2.3.2, and 2.3.3, because you clearly didn't read all of the sub-subsections.