Apparently it was the ancient Egyptians who first started wearing black eyeliner in order to ward off evil spirits, as they believed that by defining their eyes the good spirits would be able to see them better. Today, most people do not take such a superstitious approach when it comes to their makeup choices; however the appeal of black eyeliner has endured throughout the ages, simply because it looks so good.
My personal favourite is the appropriately named 'Smolder' by M.A.C. A friend of mine recently told me that his teacher used to say before exams: 'Sharp pencil, sharp mind'. I have applied this classic advice in relation to my eyeliner pencil as the sharper the pencil, the more precise and perfect your application will be although I am not sure that it would be so enthusiastically endorsed by teachers across the nation. However, do start sharp for a dramatically defined effect and then you can always smudge and soften post-application depending on the look you are trying to achieve.