When Peggy's dad was a teenager ...

  he bought a car.
  he worked full time.
  he didn't graduate from high school.

Peggy:

Dad, when did you get your first car?

Dad:

Well, Peggy, let's see. By the time I was a junior in high school, I had gotten a part-time job so that I could buy a car.

Peggy:

But you won't let me get a job!

Dad:

I know, sweetheart. But I was an immature teenager. You know, I should have taken better care of my grades instead of trying to get a car.

Peggy:

What do you mean?

Dad:

I spent so much time trying to make money that I almost didn't graduate!

Peggy:

Hmm. That wasn't a very smart thing to do.

Dad:

You're right. If I had known then what I know now, I would have appreciated school a lot more, and I wouldn't have gotten my little blue Volkswagen Bug.

Peggy:

Is that why you won't let me work after school now?

Dad:

Yes.