The Frat Pack is the unofficial name for a group of actors who have appeared in numerous films together. These appearances are often in supporting or cameo roles, and the films share an absurdist sense of humor. The name was coined by USA Today ("Wilson and Vaughn: Leaders of the 'Frat Pack'", USA Today, June 15, 2004), and is a reference to the "Brat Pack" of 1980's actors and of course Frank Sinatra's "Rat Pack" group from the 1960's. The Frat Pack name is also a reference to group's movie Old School (2003).

The core members of the Frat Pack are Ben Stiller, Vince Vaughn, Will Ferrell, and Owen and Luke Wilson, Jack Black, and Steve Carell.

-taken from http://www.the-frat-pack.com/-

Anchorman-  Ron Burgundy is the top-rated anchorman in San Diego in the 1970s. When feminism marches into the newsroom in the form of ambitious newswoman Veronica Corningstone, Ron is willing to play along at first--as long as Veronica stays in her place, covering cat fashion shows, cooking, and other "female" interests. But when Veronica refuses to settle for being eye candy and steps behind the news desk, it's more than a battle between two perfectly coiffed anchor-persons--it's war.

The Wedding Crashers-  Divorce mediators John Beckwith and Jeremy Grey are business partners and lifelong friends who share one truly unique springtime hobby--crashing weddings! Whatever the ethnicity of the wedding party--Jewish, Italian, Irish, Chinese, Hindu--the charismatic and charming duo always have clever back stories for inquisitive guests and inevitably become the hit of every reception, where they strictly adhere to their proven "rules of wedding crashing" to meet and pick up women aroused by the very thought of marriage. At the tail end of another successful season of toasting brides and grooms, Jeremy learns that the daughter of Treasury Secretary William Cleary and his wife, Kathleen, is getting married in what is sure to be the Washington D.C. social event of the year. After infiltrating the lavish affair, John and Jeremy quickly set their sights on two bridesmaids, Claire and Gloria Cleary. With the lavish reception in full swing, Jeremy works his game plan to perfection in seducing Gloria, but John's flirtation banter with Claire is unexpectedly impeded by her pompous, Ivy League boyfriend Sack. Having uncharacteristically fallen hard and fast for Claire, John convinces a resistant Jeremy to bend the crashing rules and accept an invitation to an extended weekend party at the Cleary family compound. Once at the palatial waterfront estate, John and Jeremy endure a multitude of comical mishaps at the hands of the dysfunctional members of the Cleary family, but also learn a few unexpected lessons about love and relationships.

-taken from Yahoo Movies-