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In 2003, self-described "comedy terrorist" Aaron Barschak gatecrashed Prince Harry's 21st birthday party at royal residence Windsor Castle, in southern England, wearing a pink ball gown and fake Osama bin Laden turban and beard. Bruno Vincent/Getty Images
Alan Conway -- who impersonated the secretive filmmaker Stanley Kubrick -- gained access to London's exclusive clubs and a number of celebrities' ears. He is played by John Malkovich in the drama "Color Me Kubrick." Thos Robinson/Getty Images for TFF
Karl Power, a Manchester United supporter, became an instant legend when he managed to sneak into Manchester United's pre-game team photo. Shaun Botterill /Allsport
At the 1974 Academy Awards, streaker Robert Opel raced across the stage, prompting presenter and movie star David Niven to quip: "Isn't it fascinating to think that probably the only laugh that man will ever get in his life is for stripping off and showing his shortcomings." Hulton Archive/Getty Images
Ralph Napierski -- a fake bishop -- poses with Cardinal Sergio Sebiastiana as the cardinal arrives for talks ahead of a conclave to elect a new pope on March 4, 2013 at the Vatican. VINCENZO PINTO/AFP/Getty Images
The Indian Olympic team's moment of glory at the 2012 London Games' Opening Ceremony was shared by a mystery woman in a red shirt and blue trousers who waved to the crowd as the delegation marched round the stadium. The woman was later revealed as Madhura Nagendra. Madhura Nagendra
In November 2009, U.S. President Barack Obama hosted his first state dinner and reality television stars Tareq and Michaele Salahi made their way into the White House despite not having a physical invitation. Samantha Appleton/White House via Getty Images
