1) Prior to Seth's doctoral comprehensive exams:
Mom: What did you guys do last night?
Me: Well, I stayed up and read while Seth studied. He was burnin' the midnight hour, let me tell ya.
Mom: Oh, really?....?
2) After Seth passed his doctoral comprehensive exams:
Seth: Man, I am SO glad those are over.
Me: Yeah, no kidding. But I'm really proud of you. I mean, you worked hard, really put the iron to the...oh wait,
this isn't gonna be right...iron to the mill?
I caught myself that time.