If you want to build a collection that makes a good conversation-piece for the coffee table, (and who doesn't)? It's a good idea to look out for banknotes that have some curious or out-of-the-ordinary aspect. Examples might include: an extremely large note; an extremely small note; notes printed by hand; notes with mismatched serial numbers; a note that has the same date as some important event in your life; a note with a special story attached to it; a note bearing a famous person's autograph; a note with a peculiar printing error; a note with a spelling mistake (yes, there are some); or a note bearing some unintentional visual illusion: "The devil's head note" of Canada, "the vampire note" of Germany or "the SEX note" of the Seychelles...

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