http://latex-my.blogspot.ca/2012/10/drawing-xkcd-style-plots-and-diagrams.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+MalaysianLatexUserGroup+(Malaysian+%3Cem%3EL%3Csup%3Ea%3C/sup%3ET%3Csub%3Ee%3C/sub%3EX%3C/em%3E+User+Group)