In 2013 , he portrayed American poet Allen Ginsberg in the thriller drama Kill Your Darlings , directed by John Krokidas . He also starred in an Irish @-@ Canadian romantic comedy film The F Word directed by Michael Dowseand written by Elan Mastai , based on TJ Dawe and Michael Rinaldi 's play Toothpaste and Cigars and then he starred in an American dark fantasy horror film directed by Alexandre Aja Horns . Both of the films premiered at the 38th Toronto International Film Festival .