"I've always found drugs and alcohol somewhat pedestrian. It's like, I don't need an external agent to open my mind. I'm here, conscious, alert, present. Why would I alter that?"

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When I read [the script] and saw that it was my fanboy wet dream of an Avengers script and that [Agent] Coulson was a big part of it, that was the great day for me. I just drove around the streets with the script in the other seat, giggling.

— Joss Whedon