How do we know that Couples Retreat is going to be good? Two words. Actually, four words. Vince Vaughn and Jon Favreau. Okay, that was five words. But still, those two are hilarious by themselves, and they're even more funny when they're together. Yes, Jason Bateman and Faizon Love and Kristen Bell and Jean Reno are all funny, too, but those two are like comedy peanut butter and hilarity jelly. Of course, if it was just one of them in the movie, we wouldn't be so excited, because while the two of them are great together, when left to their own devices they tend to make bad decisions. Also, their personality types balance each other out. Who wants a sandwich that's just jelly? Or just peanut butter. Nobody, that's who. Well, sometimes you do, but it's rare. Check out our guide to their best team-ups and worst solo projects, with a few good solitary ones sprinkled in. And let us know if we're off-base below.