
...Prince Harry's 21st —
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.

... film society —
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."

... Man U team photo —
Karl Power, a Manchester United supporter, became an instant legend when he managed to sneak into Manchester United's pre-game team photo.

... Academy Awards —
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."

Papal conclave —
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.

Olympic opening ceremony —
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.

... White House —
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.