Sam Heughan and Caitriona Balfe explain how they stay faithful to writer Diana Gabaldon's 'Outlander' books without going crazy. Subscribe to MTV: goo.gl/NThuhC More from MTV: Official MTV Website: www.mtv.com/ Like MTV: www.facebook.com/MTV Follow MTV: twitter.com/MTV MTV Google+: goo.gl/OGY79b MTV on Tumblr: mtv.tumblr.com/ MTV Instagram: instagram.com/mtv MTV on Pinterest: www.pinterest.com/mtv/