Mostel: If I appeared there, what if I did an imitation of a butterfly at rest? There is no crime in making anybody laugh. I don't care if you laugh at me.
Congressman Jackson: If your interpretation of a butterfly at rest brought any money into the coffers of the Communist Party, you contributed directly to the propaganda effort of the Communist Party.
Mostel: Suppose I had the urge to do the butterfly at rest somewhere?
Congressman Doyle: Yes, but please, when you have the urge, don't have such an urge to put the butterfly at rest by putting some money in the Communist Party coffers as a result of that urge to put a butterfly at rest.

There's a kind of silliness in the theater about what one contributes to a show. The producer obviously contributes the money... but must the actor contribute nothing at all? I’m not a modest fellow about those things. I contribute a great deal. And they always manage to hang you for having an interpretation. Isn’t [the theater] where your imagination should flower? Why must it always be dull as shit?