Jim Halpert (John Krasinski) is a paper salesman at the Scranton branch of Dunder Mifflin. He is a good guy, and very intelligent albeit unmotivated. Throughout the four seasons of the show and counting, Jim spends most of his time pining for Pam Beesly and/or engineering pranks at the expense of office-mate Dwight Schrute.
Dwight: I need you to promise me that you'll be on your best behavior.
Jim: I promiseeeeed other people that I'd be on my worst behavior, and I gave 'em my word so...
Michael: That is a $200 plasma TV you just killed! Good luck paying me back on your zero dollars a year salary plus benefits, babe! [Jan runs upstairs crying]
Woman: I'm gonna get going.
Dwight: Fine. Get outta here.
Jim: It's getting late.
Michael: You know what guys? She'll be out of the bathroom real soon.