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Patrick Stewart refreshing McAvoy on how to do the classic Patrick Stewart Scream.

James McAvoy plays young Professor Xavier in the new movie X-Men: Days of Future Past, and Michael Fassbender plays a young Magneto. Also in the film are Patrick Stewart and Ian McKellen, who play older, present-day Professor X and Magneto, respectively. So, you'd really hope they have impressions of them, otherwise everyone watching the movie would be wondering why McAvoy and Fassbender lost their Scottish and Irish accents and turned full-blown English.

Sources: Gawker