American James Miller was fined £ 200 and deported . : : In 1995 , student John Gillard rammed the palace gates in his car at 50mph , tearing one off its hinges . : : In 2003 , an undercover reporter from the Daily Mirror got a job as a footman at the palace . : : The same year , a major investigation was launched after " comedy terrorist " Aaron Barschak gatecrashed Prince William 's 21st birthday party at Windsor Castle .