 Before turning to acting, Behan had a brief career in journalism in Ireland: "I interviewed everyone from priests to prostitutes before my Dublin paper folded." Behan was also involved in theatre work – he was a costume assistant during the original production of Tom Murphy's adaptation of Liam O'Flaherty's 1925 novel The Informer on 13 October 1981 at the Olympia Theatre in Dublin. He participated in various other plays in Dublin, but finding them "all very over the top, very amateurish, full of people turning up drunk or not turning up at all", he decided to leave Ireland and pursue art studies in Berlin.
