President of Argentina
Under the 1994 constitutional amendment, the President serves for four years, with a possibility of immediate reelection for one more term. However, unlike the President of the United States, in Argentina, a person may be reelected again after serving for two terms and staying out of office for the following term. So after serving for two consecutive periods, the president is not allowed to run for a third consecutive one, but may return for the two following elections and so on. There is no limit for a person to be a candidate if he or she does not win the elections.
William Henry Harrison
Harrison became the first United States president to die in office. His last words were to his doctor, but they were assumed to be directed at Vice President Tyler: "Sir, I wish you to understand the true principles of the government. I wish them carried out. I ask nothing more." Harrison served the shortest term of any American president: March 4 – April 4, 1841, 30 days, 12 hours, and 30 minutes.