I find two of the most interesting theories to be the Desensitization Theory and Sensitization Theory. The Desensitization Theory states that there is so much violence on television that viewers become less sensitive to the violence. The Sensitization Theory explores the exact opposite opinion by stating the large amount of violence on television will traumatize viewers and result in them being more sensitive to violence.
The video below is a great example of the Desensitization Theory in our culture. It not only talks about violence on television, but also drug use and our perception of women.