There was a recent article I saw posted on IMDb that talked about this so I figured it would be a good thread to share one's frustration.
I'll have to come up with some later, but here are a few recent ones that really got to me:
Flight - The hotel room at night - I mentioned this in my review and I won't give away much of the "spoilers", but the framing, the editing, and the writing in this scene in particular was just so obvious and over the top and horrible. The audience was extremely into this scene filled with gasps and applause and groans. I mainly just groaned.
Dark Shadows - Chloe Moretz's reveal at the end - I saw a test screening for this a couple months before the film was released and haven't seen the movie since, so I don't know if the scene has changed since then (I'm guessing it's exactly the same), and man, it was such a throwaway twist, and the line delivery was so awful.
Lovely Bones - Lord of the Rings poster - While the entire movie was extremely absurd and rancid, this scene in particular was so horrible. I don't mind when directors pay homage to their previous films if it's cleverly done, but man, Peter Jackson might as well have had the camera zoom in on the poster Lord of the Rings to reveal Golum inside the bookstore buying a copy of King Kong on DVD.
Saving Prive Ryan - the cemetery bookends - I know this has been discussed before in great length on this site (I think I may have started the conversation once before in a Bookends List thread), but yeah, this was just so tacked on and shoved the emotion down your throat. I'm surprised they didn't have a scene after the end of the character dying and him getting a 21 gun salute at the very same cemetery with his grave right next to other gravestone while all of the relatives place stones around it.