BBC America
November 04, 2013 at 04:45 PM EST

Why so scared, Harrison Ford? Is it a rolling boulder, a hijacked presidential plane, an umpteenth question about a Star Wars reprise that could cause your face to contort with such fear?

Nope, it’s just Benedict Cumberbatch doing his best guerilla Chewbacca impression on The Graham Norton Show — in which he and Ford were guests back on Oct. 19.

Host Graham Norton brought up the subject of Cumberbatch’s penchant for celebrity impersonations, to which the Sherlock star replied, “It’s just sort of having an ear, it’s part of what we do, I guess,” before belting out the Wookiee’s cry. Ford’s response? Jaw-dropping confusion and shell-shock.

Watch Cumberbatch’s impression make Harrison Ford nearly lose his marbles below:

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