Matthew McConaughey, Keanu Reeves, Zac Efron Honor Richard Linklater in '21 Years' Trailer

'Boyhood' Director and Cast
Austin Hargrave

From left: director Richard Linklater, Ellar Coltrane, Ethan Hawke and Patricia Arquette of Boyhood, which was shot in 39 days over the course of 12 years.

Says Jack Black of the director: "He's a sneaky Shakespeare"

The first trailer for 21 Years: Richard Linklater shows the director's far-reaching influence, as stars flock to honor the filmmaker onscreen — some more poignantly than others.

While Ethan Hawke notes that "he's onto something special, that's unique to him" and Julie Delpy describes him as wise and laidback, Jack Black also says, "He's a sneaky Shakespeare, and Matthew McConaughey calls him "Ricky Ticky Linklater" (and not without an "alright, alright, alright" as well). Keanu Reeves also adds, "There's no slacker in that Slacker."

Watch more Richard Linklater Reveals Why 'Boyhood' Took 12 Years to Film

The tribute documentary, directed by Michael Dunaway and Tara Wood, is based on the idea that the first 21 years of an artist can define them, and looks back at that time period in Linklater's life. Zac Efron, Kevin Smith, Billy Bob Thornton, Mark Duplass, Jay Duplass, Parker Posey, Jason Reitman, Miranda Cosgrove, Joey Lauren Adams, Louis Black, Rebecca Campbell, Nicky Katt, Greg Kinnear, Michael McKean, Steven Chester Prince, Anthony Rapp and Marissa Ribisi, among others, also appear in the film.

Watch the trailer below.

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