I bought it when I was in the seventh grade.
5 seconds sound clip from the Grease (1978) movie soundboard.
You can hear this line at 00:37:17 in the Blu-ray version of the movie.
Quote context
[...]
- My 25-cent insurance policy.
- I bought it when I was in the seventh grade.
- What the hell you think you're doin'?
- You're parked in a no-parking zone, creep.
- The whole place is a no-parking zone, crater face.
[...]