1. Compensation
1.1. Trying to make up for areas in which a lack is perceived by becoming superior in some other area.
1.1.1. Bender isn't very good at school and to compensate for that, he decided to do wood shop and he greatly succeeds doing it. He defends this attribute by saying wood shop is more important that math. This is an example of Bender compensating for the areas that he lacks in. Bender is not exactly academically smart, so he compensates by putting all of his effort into something more labor and skill intensive.
2. Phallic
2.1. Resolving Oedipus/Electra complex: learn gender rolls through identification with same sex parent. An unresolved conflict at this stage can lead to vanity, self-obsession, sexual anxiety, and feelings of inadequacy, inferiority, and envy.
2.1.1. Bender repeatedly talks to Claire about her virginity, and the sexual experiences of others in the group. He makes it a big deal and basically forces Claire to admit that she is a virgin.
3. Id
3.1. Part of the mind in which innate instinctive impulses and primary processes manifest.
3.1.1. He rips apart multiple books in the library simply because he has the impulse to do so. When told to stop by a fellow classmate, he looks at him, and continues to rip the book.
4. Circadian Rhythm
4.1. Physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in an organism's environment.
4.1.1. Bender falls asleep during the day even though the lights are bright, probably due to his circadian rhythm making him feel tired at that time.
5. Personal Fable
5.1. A belief held by many adolescents telling them that they are special and unique, so much so that none of life's difficulties or problems will affect them regardless of their behavior.
5.1.1. After Claire compares herself to Bender, he replies, "You're so pathetic. Don't you ever, ever compare yourself to me, okay. You got everything, and I got shit." Bender believes that he is unique and that no one can compare their personal troubles were his because Bender has it especially bad and has the worse parents of anyone. He believes in his personal fable and gets angry when anyone even tries to contest it.
6. Neglectful Parent
6.1. This is when the parent sets few rules, doesn't monitor their children, and offers little active support. This can result in the child hating himself, hiding or avoiding his feelings, being disrespectful and a loner, and performing poorly.
6.1.1. Bender's mother and father are physically and emotionally abusive. When John explains what really goes on in his household, he explains how his father doesn't care and has low warmth and responsiveness, even going so far as to only give him a carton of cigarettes for Christmas and burning him with a cigar. This results in Bender being extremely disrespectful to teachers, hiding his feelings of fear and sadness, and performing poorly in school.
7. Groupthink
7.1. The desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome.
7.1.1. Bender takes the fall for the group when they were trapped in the hall and about to be caught out of their detention seats. When Bender thought they were going to get caught, he ran the other way, and made noise to draw the teacher towards him. Despite the irrational decision of getting himself in trouble, he maintained harmony in the group because he, the person who always gets in trouble, got in trouble again and saved the rest of the Breakfast Club.
8. Implicit Stereotype
8.1. Unconscious attribution of particular qualities to a member of a certain social group.
8.1.1. Everyone believes that Bender is a criminal and does not care about anything despite later showing genuine feelings for Claire. He is perceived to be a loner and a loser and Bender even conforms to this implicit stereotype to some extent.