When, you make them and are not forced to for math class.  If you go to graph jam, which is part of the icanhascheezburger website family, you can make graphs with your own captions.  Favorites of ours: William Shakespeare readership vs. Stephanie Meyer readership in year 2030, and relevancy of Ferris Buller’s Day Off to high school students.  Will that ever be irrelevant?  So crack up your friends (and yourself) and whip up your own graph that won’t become irrelevant!