With Mistaken for Strangers, the National documentary set to premiere at the Tribeca Film Festival later this week, the band released the first trailer. It appears to be less a straight documentary about the band and more an unusual documentary about their lead singer’s brother, Tom Berninger, who had decided to film them. The film follows Tom’s failed turn as the band’s assistant tour manager as Matt Berninger and his band become more and more successful. It’s a story of two brothers fighting and learning to accept one another. You know, it’s the same sort of light fare that we saw in Katy Perry’s 3-D movie.