Oh, I have it now. You're the truant officer.
3 seconds sound clip from the Chitty Chitty Bang Bang (1968) movie soundboard.
You can hear this line at 00:15:00 in the Blu-ray version of the movie.
Quote context
[...]
- Would you mind just pressing that switch there? Yes, just behind you. On the right. The right.
- You really ought to try and exercise more control over them.
- Don't your children go to school?
- Oh, I have it now. You're the truant officer.
- No, I'm not the truant officer.
- Well, didn't you ever play truant? I mean, just once?
- No, I most certainly did not.
- Would it be too much to ask what this is, this, um, thing?
[...]