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“So the particular strengths of the colon are beginning to become clear. A colon is nearly always preceded by a complete sentence, and in its simplest usage it rather theatrically announces what is to come. Like a well-trained magician's assistant, it pauses slightly to give you time to get a bit worried, and then efficiently whisks away the cloth and reveals the trick complete.” — Lynne Truss
So the particular strengths of the colon are beginning to become clear. A colon is nearly always preceded by a complete sentence, and in its simplest usage it rather theatrically announces what is to come. Like a well-trained magician's assistant, it pauses slightly to give you time to get a bit worried, and then efficiently whisks away the cloth and reveals the trick complete.