This is by far the most disturbing movie I've ever seen:
"Good luck chuck"
http://www.imdb.com/title/tt0452625/
It's still the only movie that I ever rated 1 / 10 at IMDB.
This is much worse than any of the movies above and the mental damage is irreversible.
It really makes one wonder
a) how could adults put together such a "piece"
b) how could another adult in charge OK something like this for production
c) there are obviously people that liked it
Don't ask me about details how I even made it to watch a "romantic comedy" with "Jessica Alba"
)