Diane and her father telling the story about her being afraid of flying.
Lloyd's speech about what he wants - and doesn't want - to do as a career:
Lloyd: You mean like career? I don't know. I've thought about this quite a bit sir, and I would have to say, considering what's waiting out there for me: I don't want sell anything, by anything or process anything as a career. I don't want to sell anything bought or processed; buy anything sold or processed; or process anything sold, bought or processed; or repair anything sold, bought or processed; you know, as a career, I don't to do that. So, my father's in the army, he wants me to join, but I can't work for that corporation.
After Diane breaks up with Lloyd, Joe, Mark, and some other guys are giving Lloyd advice on what to do next. Finally, Lloyd has had enough:
Joe: (after everyone pauses and looks down at the ground) By choice, man!
After Diane tells her father about sleeping with Lloyd, she tells him how good it feels to tell him the truth, and if she didn't tell him, it'd be like it didn't happen. The look on Mr. Court's face is priceless.
The exchange leading up to that:
Diane: Dad, do you know what he did the first night I went out with him? We were walking across by the Seven-Eleven, and he pointed out some glass for me to walk around. And I always think of that when people say 'What are you doing with Lloyd Dobler?' And I never get nervous around him. So we started spending all this time together, as friends. But, I could feel him getting anxious, and then I knew that there would be a confrontation over getting physical. And he started to get that look at the end of the night. Do you know that look?
Diane: And then, you know it's going to be an issue. So I went through all the different feelings and all the different arguments you're supposed to go through.
Jim: Did he ever get rough with you?
Diane: Dad, no. But I didn't want any problems, so I decided not to sleep with him.