First Amendment lawyer Marc Randazza has found a gem: an opinion from the Texas Supreme Court quoting Walter Sobchak in “The Big Lebowski” on prior restraint (see the video above). With this, you can cite to a case instead of a movie. Here is the citation you need:
Kinney v. Barnes, 57 Tex. Sup. J. 1428 at n.7, (Tex. 2014) (citing SOBCHAK, W., THE BIG LEBOWSKI, 1998).
I’m not sure about those all-caps, but I will defer to Marc.