In Couples Retreat, opening this weekend, Vince Vaughn and Jason Bateman and actresses who are too young and hot to be with either of them (Kristen Bell, Malin Ackerman) play, well, couples on a cheap-o vacation at a gorgeous tropical resort. The only hitch: they have to endure couples therapy -- for, one hopes, the amusement of the theatre audience.

As long as movies have needed "plot conflict," bickering screen couples have existed. Here are just 10 who could use a little therapy.