Sheldon tries to make friends by following the principles that Dale Carnegie has outlined in his book, "How to Win Friends and Influence People." His conversations are robotic, not authentic, and awkward as a result.
The opening of an authentic Civil Defense film that was released shortly after the Soviet Union tested its first atomic bomb. It was produced to reassure and help prepare everyday citizen in the case of an attack.
Grim's new girlfriend doesn't believe Grim when he claims he can tell when people are "faking it" so she fakes having a heart attack. This completely convinces everyone else, including Grim. Compulsive liars can convince others of their lies because they convince themselves so much that they act out their lies authentically. They've been known to convince themselves so absolutely, they pass phonograph lie detector tests.