Mark: [aside to camera] Leslie is unique. Government work can beat you down. I would say that I lost my optimism about government in about two months. Leslie's kept hers for six years. I've got a few rules about how to survive and prosper in a government job, and I think I'm about to break one of those rules.
[later:]
Mark: I want you to give Lot 48 to Leslie so she can try to build a park.
Ron Swanson: Why should I?
Mark: You owe me one, remember?
Ron Swanson: Do you want to cash in for this?
Mark: Yeah, I do.