Ben says "every action has an equal and *negative* reaction." However, he is misstating Newton's Third Law of Motion, which is: "For every action there is an equal and *opposite* reaction."
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Dr. Katz says that Ben is like a caterpillar weaving its cocoon -- spiders weave there webs, but caterpillars don't weave their cocoons.
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Ben: I'll tell you something Dad: every action has an equal and negative reaction. So uh, if you don't act, nothing negative happens.
Dr. Katz: You're talking physics now. You're matching me science for science. Okay, how about biology: I will kill you if you don't get out of this house you slug.
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Dr. Katz: Just like the caterpillar weaves its cocoon, you have weaved a cocoon, and I think that you're ready to break free of the confines of the cocoon.
Ben: And become the big fat butterfly that ...
Dr. Katz: I was thinking of a Gypsy Moth.
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Dr. Katz: I know how annoying it is when I bring up the subject of employment.
Ben: This is what I mean about the coffee; you have a cup of coffee and then you want to talk. And uh, that's not necessarily good for me.
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