You must watch the episode of Foster's where Mac and Bloo saves Abraham Lincoln Inkpen from being locked in a closet. In the last 10 minutes of the episode, Lincoln pen reveals he is evil and states that he is the "47th president of the United States." Put aside that Lincoln was the 16th president of the US, that's too obvious and a joke most likely. Remember also that this pen was created (from the first 2 minutes of the show) to cheat by feeding answers to its creator about US presidents. The slip up here I feel is in historical accuracy, there has only been 43 US presidents, at George W. Bush. Doing the math, we're 4 presidents off.