Keira Knightley Finds Benedict Cumberbatch's Fans Terrifying (But Lovely)

Keira Knightley has experienced the Cumberbitches and lived to tell the tale. » Subscribe to Late Night: http://bit.ly/LateNightSeth » Get more Late Night with Seth Meyers: http://www.nbc.com/late-night-with-se... » Watch Late Night with Seth Meyers Weeknights 12:35/11:35c on NBC. Follow Late Night:   / latenightseth   Late Night Tumblr:   / latenightseth   Get more NBC: NBC YouTube: http://full.sc/MtLxIM Like NBC:   / nbc   Follow NBC:   / nbc   NBC Tumblr:   / nbctv   Late Night with Seth Meyers on YouTube features A-list celebrity guests, memorable comedy and the best in musical talent. Keira Knightley Finds Benedict Cumberbatch's Fans Terrifying (But Lovely)    / latenightseth