A Third Winner!

The winning answer came in today from Todd (e)MDTJ with the answer that the quote is indeed from "Taxi Driver"
http://www.imdb.com/title/tt0075314/

Go pay Todd at visit at http://www.empireavenue.com/influencer/?u=MDTJ

The full passage was:

Office Manager: No trouble with the Hack Bureau?
Travis: No Sir.
Office Manager: Got your license?
Travis: Yes.
Office Manager: So why do you want to be a taxi driver?
Travis: I can't sleep nights.
Office Manager: There's porno theaters for that.
Travis: I know. I tried that.