Well, I'm not that harmless.
4 seconds sound clip from the Forbidden Planet (1956) movie soundboard.
You can hear this line at 00:25:33 in the Blu-ray version of the movie.
Quote context
[...]
- Well, I hate to tell you this, Alta, but that man is notorious throughout seven planetary systems.
- I'm so glad you don't have any fire in your eyes, lieutenant.
- Well, I'm not that harmless.
- Alta.
- These gentlemen have expressed a very kindly concern over the amount of liberty you have.
- Liberty?
- I've explained to them that you have my permission to visit Earth whenever you choose.
[...]
Forbidden Planet (1956) Sound Clip
Actors: Walter Pidgeon (Dr. Edward Morbius), Anne Francis (Altaira "Alta" Morbius), Leslie Nielsen (Commander John J. Adams), Robby the Robot (Marvin Miller)
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