10 Times Actors Broke Character In Movies
2. Ewan McGregor - Star Wars: Episode III - Revenge Of The Sith
You can't really blame the cast of the Star Wars prequels for struggling to keep a straight face and maintain their character given some of the utterly risible dialogue they were forced to tear through.
And in Ewan McGregor's case, one of his breaks ended up making it into the final cut of Episode III - Revenge of the Sith, when Obi-Wan (McGregor) informs Padme (Natalie Portman) that he's seen a security hologram of Anakin (Hayden Christensen)... "killing younglings." Younglings in this context being Jedi Padawans.
Now, having Obi-Wan use the dead-silly word "younglings" in the middle of an extremely serious description of child murder is poor writing on George Lucas' part, and McGregor apparently thought much the same, as when he delivers the line read he's visibly struggling not to bust up laughing.
McGregor, ever the vet, takes a sharp breath with a dead-eyed look that says "Am I really about to say this s**t?," before lifting his hand to cover his mouth as he desperately tries to stifle a laugh.
Nobody could possibly blame you for this, Ewan.