When a person who uses a fake name actually adopts the name as their legal name.
Named for the British actor Sir Michael Caine. His real name is actually
Maurice Micklewhite, Jr. And whenever he tried to go through airport security, the guard would instantly recognize him. "Oh, you're Michael Caine!"
But when Caine would show his passport, which displayed his real name, he would always have to go through the incredibly
annoying task of proving that
Maurice Micklewhite, Jr. is in fact the same person. Eventually, he got fed up with it and legally changed his name to Michael Caine once and for all.