Well, you see, mother, this was rather unexpected...
3 seconds sound clip from the Remember the Night (1940) classic radio play.
You can hear this line at 00:29:17 in the radio play.
Quote context
[...]
- Hello. I hope I won't be too much trouble.
- Trouble? Why, bless you, child. It's a joy to have ya here. No trouble at all.
- But, John Sargent, why didn't you send me a telegram?
- Well, you see, mother, this was rather unexpected...
- Emmy? Did you leave those cookies in the oven?
- Come along now, everyone. This way, Miss Leander.
- Thanks.
- Oh boy, John. Ain't she a peach-o-Reno?
- Who? Oh.
- All I can say is... Hot dog!
[...]