Really, Johnny, you're overdoing the spaceman act. There simply aren't any such things.
6 seconds sound clip from the Robot Monster (1953) movie soundboard.
You can hear this line at 01:08:05.502 in the Blu-ray version of the movie.
Quote context
[...]
- Boy, was that a dream or was it?
- Well, I must try to repay you for all the trouble you've gone to.
- Won't you and your assistant join us for dinner?
- Do!
- Done.
- Will you play house with me when we get home?
- But I've got to keep an eye out for Ro-Man.
- Really, Johnny, you're overdoing the spaceman act. There simply aren't any such things.
[...]