It's weird, because the movie is at its funniest in third act, even though it's usually not like that. (rottentomatoes.com)
There's this whole, you know, third act of films you've made that have quite a pessimistic view of life. (businessinsider.com)
And that work to establish how vital he is to the whole process pays off in the film's crushing third act when the disease begins catching up to him. (alphaprimitive.com)