The road to bromance isn't always paved with emotional talks about each dude's innermost thoughts and feelings or excessively long garage-band jams, as illustrated in the bromance to end all bromances between Peter Klaven (Paul Rudd) and Sydney Fife (Jason Segel) in 'I Love You Man.'

Sometimes, potential bros can't stand each other at first, as in this week's release 'Due Date' starring Robert Downey Jr. as a father-to-be forced to hitch a ride with an annoying aspiring actor, played by Zach Galifianakis. But this rocky beginning doesn't necessarily mean the two men can't eventually develop a beautiful friendship, much like the original cinematic bromance between Rick Blaine (Humphrey Bogart) and Captain Louis Renault (Claude Rains) in 'Casablanca.' Even though Rick double-crossed Renault, the movie ends with the two men sauntering off into the fog, with Rick proclaiming, "Louis, I think this is the beginning of a beautiful friendship.'

There have been so many beautiful friendships among movie bros since 'Casablanca,' it can be a bit difficult to keep track of them all. It's even starting to look like the bromance genre has unwittingly generated a number of subgenres, including (but not limited to): Bros who hate each other at first but grow on each other (see list below); lifelong bros whose friendship is tested but emerges stronger than ever ('Superbad,' 'Stand By Me'); bros who go on a man-cation together and reinforce their bond, even if that wasn't the original intention ('Hot Tub Time Machine,' 'Swingers'); and bros who have just met and develop their bond over the course of the movie ('I Love You, Man,' 'Funny People'). Since 'Due Date' would fall into the "bros who hate each other at first but grow on each other" subgenre, here's a list of the top 5 movie bros who overcome their initial hostility to develop a beautiful friendship.

  1. 1. Neal Page (Steve Martin) and Del Griffith (John Candy) in 'Planes, Trains and Automobiles.' It's hard not to think of the premise of 'Due Date' without thinking of this John Hughes classic. Two men from opposite worlds are thrust together by their mutual quest to reach their respective destinations. Neal is incredibly rude to nice guy Del, who only wants to help. Eventually Neal recognizes that he's been a total jackass, and accepts Del into his life as a true bro. Awww.

  2. 2. Derek Zoolander (Ben Stiller) and Hansel (Owen Wilson) in 'Zoolander.' Incredibly good-looking male model Zoolander can't stand the spotlight-stealing Hansel at first. The two even engage in a heated walk-off at one point, moderated by the incredibly good-looking David Bowie. When a murder plot drives the two not-so-smart models together, they realize just how similar they are, and begin to form an incredibly good-looking bond.

  3. 3. Chazz Michael Michaels (Will Ferrell) and Jimmy MacElroy (Jon Heder) in 'Blades of Glory.' Figure skating's bad boy, Chazz, and golden child, Jimmy, are sworn enemies. When their mutual hatred erupts into an ice fight, both are kicked out of the men's singles figure skating league and the two eventually become washed up has-beens. To get their careers back on track, the men pair with each other to compete in the doubles league, and a bromance begins to blossom.

  4. 4. Billy Hoyle (Woody Harrelson) and Sidney Deane (Wesley Snipes) in 'White Men Can't Jump.' Add "bromance" to genres that can describe this sports-comedy-drama. Sidney hates basketball hustler Billy at first, after Billy wipes the court with him. However, enterprising Sidney recognizes an opportunity when he sees one, and partners with Billy for some 2-on-2 hustling action. As the two spend more time together, they warm to each other and become devoted frenemies. Isn't that sweet?

  5. 5. Rocky Balboa (Sylvester Stallone) and Apollo Creed (Carl Weathers) in 'Rocky III.' Much like Billy and Sidney and Chazz and Jimmy, Rocky and Apollo start off as bitter rivals. In the third installment of the Rocky franchise, though, Apollo transitions from enemy to friend when he pulls Rocky out of his depression and whips him into shape so he can fight Mr. T. Now that's a friend. The two clearly fall into bro-love. I mean, just watch that training montage. The matching tank tops and knee socks say it all.
Blades of Glory
PG-13 2007
Based on 35 critics

Banned from singles competition, rival male skaters find a way to compete as a pair. Read More

Rocky III
PG 1982
In Theaters on April 20th, 2009

Ex-champ boxer (Sylvester Stallone) trains for rematch with new champ (Mr. T). Read More

Due Date
R 2010
Based on 39 critics

A high-strung man (Robert Downey Jr.) takes a road trip with an annoying stranger. Read More

White Men Can't Jump
R 1992
In Theaters on March 27th, 1992

Black-and-white hoop hustlers (Wesley Snipes, Woody Harrelson) cash in. Read More

Planes, Trains and Automobiles
R 1987
In Theaters on November 26th, 1999

A stranded ad exec (Steve Martin) and a salesman (John Candy) make unlikely co-travelers. Read More

PG-13 2001
Based on 30 critics

A supermodel (Ben Stiller) becomes mixed-up in an assassination plot. Read More

categories Columns, The Rundown