At his audition for Euron Greyjoy in Le Trône de fer (2011), he improvised the second out of 2 scenes. His email hadn't worked so he'd only received the first scene. Never had he been so unprepared for an audition before, he said himself.
When you watch the films that I'm inspired by - from the '60s and '70s - it's not about the special effects: it's about the story; it's about characters and relationships.