My favorite moment in almost any story is when the chill guy finally loses his shit.
As an old example, like the moment that Hamlet is going to fucking Kamikaze with Claudius.
Lion King was written ...
Or as I read on a Madex/Spacebull piece, (and sorry, I can't remember it exactly) "Beware the quiet ones who only want to be left alone." [I mentally added: Because they will fuck. your. shit. up.]