Loneliness, despair and sadness seem to be the key factors that lead Phoenix’s Arthur Fleck down the path to super-villainy. We see a man being abandoned by the one person who can help him with his mental despair (his psychologist?), and a cold Gotham City that doesn’t seem to understand Fleck’s constant desire to laugh (perhaps to keep from crying?). When Fleck makes a young boy on the bus laugh with his goofy faces, he’s immediately met with a threat from the boy’s mother to cut it out and scram. Fleck tells the mental health worker assigned to him that “all I have are negative thoughts,” foreshadowing his future of crime.