8. Angelina Jolie and Jennifer Aniston
I cant see Jennifer Aniston doing an action movie and I cant see Angelina Jolie doing a comedy. However there is still bad blood between these two over Brad Pitt, even though Aniston has moved on to a different man. Work their dislike for each other in the script, a combined comedy action, and you got yourself a hit. Throw in Pitt if you want to make things even more interesting.
Movie: A cruise ship is taken hostage. A waitress and a cop team together to take it back.