How is “why not” used?

In Stranger Than Paradise (1984), one line is: “- Yeah, we could. Why not? I don't know. - Yeah.”

Which movie is “why not” from?

The clip at the top of this page is from Stranger Than Paradise (1984).

used to ask why something is not so, was not done, or is not allowed; used to make or agree to a suggestion

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Definición editorial65% de las películas
used to ask why something is not so, was not done, or is not allowed
Oxford35% de las películas
used to make or agree to a suggestion

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

- Yeah, we could. Why not? I don't know. - Yeah.

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