Vífill Atlason, a 16 years old boy from Iceland got Bush’s private number and decided to call and joke about being the Icelandic president at that time Ólafur Ragnar Grímsson. He called and insisted a private meeting with the USA president. According to Vífill he had passed a several levels of security (speaking with a couple of people) asking him a “security” questions about the Icelandic president like date of birth, parents names, where he grew up and the date he entered office. The kid easily answered all the questions, because he had a couple of websites (like wikipedia) in front of him by that time. When he passed through all security levels he spoke with Bush’s secretary and she told him that she will put him on the call list for the next day and to expect a call back from Bush, because he wasn’t available at that moment.
Later that day the kid was arrested and questioned. The police insisted to know where he got the number and so on. The kid faced no charges and was released under his parents custody later that day.