How is “like a bad dream” used?

In Tombstone (1993), one line is: “Now there's six of 'em. Hell, this is like a bad dream.”

Which movie is “like a bad dream” from?

The clip at the top of this page is from Tombstone (1993).

Now there's six of 'em. Hell, this is like a bad dream.

6 作品で登場 · 1 本目

so unpleasant that you cannot believe it is true

6 本の映画に登場

オックスフォード映画の 100%
so unpleasant that you cannot believe it is true
Barry, this is awful. It's like a bad dream.
Now there's six of 'em. Hell, this is like a bad dream.

定義：Oxford Advanced Learner's Dictionary 第 9 版