What is a movie where you groaned loudly due to the Bull Sh*tness,.?

Almost every fictional story I've ever seen. If the movie lasts two hours, the first hour and 45 minutes are alright, then in the last 15 minutes, it is as if the writers got tired. Wrapping up a long drawn out story with lines such as "Oh well. What are you gonna do?" just ruins the whole show and make me wish for my 2 hours and $7.50 back. I am ashamed to be seen walking out of the theater, the movie is so stupid.