Stu lives for the simple things in life - free food at the office, Giants games on Sunday, and women with big boobs. He acts purely out of instinct, with no regard for the consequences of his actions. He's actually kind of ambitious, but for all the wrong reasons. He wants to receive credit for a dirty joke he wrote, he wants to get on TV at the Giants game by painting his body blue and streaking. Things like that. Poorly focused energy.
Convincing Tim to fight an old man.