I don't really collect anything anymore (unless books count!), but I think everyone has accidentally started a collection at some point. Usually it happens when well-meaning friends and relatives decide that you collect something. If people notice that you have two or three things with roosters on them or if you casually mention that rooster paintings are cool, expect to get a flood of rooster-related gifts for Christmas. My mom started a teapot collection this way. My aunt started a pig collection this way. My sister received teddy bear themed gifts until she was 21 or so.