But what's this? I thought you were going along with me.
5 seconds sound clip from the The Wizard of Oz (1939) movie soundboard.
You can hear this line at 00:14:40 in the Blu-ray version of the movie.
Quote context
[...]
- Well, that's all. The crystal's gone dark.
- You don't suppose she could really be sick, do you?
- Oh, I've gotta go home right away.
- But what's this? I thought you were going along with me.
- No, I have to get to her right away!
- Goodbye, Professor Marvel. And thanks a lot!
- Poor little kid. I hope she gets home all right.
[...]