Seeing as his co-stars Franco and Natalie Portman shot the medieval stoner comedy just before diving into their Oscar-nominated performance, he feels he deserves a little credit.
"James in '127 Hours' acts with a rock basically the whole entire movie and I feel like I prepared him for that performance. I was his rock in this movie," he tells MTV Radio for NextMovie backstage at "The Seven."
As for hittin' the wizard weed, it's all about moderation, he says.
"If you're going to go fight a dragon, it's good to be a little under the influence of wizard weed because could calm the nerves, but you don't want to be too much under the influence because it could slow you down, dragons breathe fire, you could be done."
Now that that's all cleared up, be sure to watch our entire interview with McBride below.