Sheldon: [after Amy proposed for Sheldon to meet her mother] What am I supposed to do?
Leonard: Well, have you considered telling her how you feel?
Sheldon: Leonard, I'm a physicist, not a hippie.
Leonard: All right, well, let me see if I can explain your situation using physics. What would you be if you were attached to another object by an inclined plane wrapped helically around an axis?
Sheldon: Screwed! [he realizes what he said]
Leonard: There you go.

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