One of the funniest reactions that an actor can give a character is to nod along to craziness.
It is an entirely unconscious gesture. We all do it. When it is captured on film, it is hilarious.
That is, one person will start going on about conspiracy theories or evil co-workers or talking pets or...anything really. And the other person nods along.
In face-to-face communication, the nodding usually entails understanding, as in, "I hear you" or "I am keeping up." Consequently, you will often see people nod "yes" and then say, "No, I can't."
In Love by Chance, Season 1, when Saint and Plan as Pete and Can have their impromptu conversation about Tin, Pete continues to innocently nod to everything Can says even though Can is rambling, and Pete disagrees when Can asks him a direct question.
Then Can bolts, leaving Peter totally confused.
A related "nodding" scene takes place in My School President. Gun thinks that the student council should do something more inviting than "take a picture with the president" for the school fair. Tiwson agrees and argues that anything "would be better than this." He then addresses a female member of the student council who is sitting on the floor and basically getting on with things: "Do you agree?"
She nods nonchalantly and keeps doing what she is doing. Yeah, sure, why not? Whatever, guys. Just make a plan already.
Very good comedy.
