What makes you decide to quit watching a movie (on TV)

You are sitting down to watch a movie on television, one you haven’t seen before.
What has to happen in it to make you switch channels and leave the film be?
Do you give the movie a second chance for some more minutes after you witnessed the annoying fact?

I am done with a movie when they feel the need to explain a whole background of a character in three sentences in the beginning minutes.