Because you like Charlie Bucket in Charlie and the Chocolate Factory
Roger Kint is a nervous, weak, ham-handed criminal. We think. See them in The Usual Suspects.
In charge of stocking the office's supply of cigarettes and liquor, Joan Holloway could run the whole company if they would let her. See them in Mad Men.
After becoming accepted into the group of popular girls, Tracy Freeland has turned from a sweet and reserved teenager into a monster. See them in thirteen.
Did he ever tell you the definition of insanity? Just wait, and this psychopath will do just that. See them in Far Cry 3.