How is “be in for” used?

In 20th Century Women (2016), one line is: “You're gonna be in for a legendary surprise.”

Which movie is “be in for” from?

The clip at the top of this page is from 20th Century Women (2016).

You're gonna be in for a legendary surprise.

7 作品で登場 · 1 本目

イディオム

to be going to experience sth soon, especially sth unpleasant

くだけた · 9 本の映画に登場

be in for sth
to be going to experience sth soon, especially sth unpleasant
He's in for a shock!

定義：Oxford Advanced Learner's Dictionary 第 9 版