Well, you were wrong.
3 seconds sound clip from the Spaceballs movie soundboard.
You can hear this line at 00:26:11 in the Blu-ray version of the movie.
Quote context
[...]
- Now we will show her who is in charge of this galaxy.
- Hold it. I'll handle this personally.
- So, Princess Vespa, you thought you could outwit the imperious forces of Planet Spaceball.
(PNEUMATIC SLIDING DOOR OPENING)
- We're picking up the outline of a Winnebago.
[...]