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troperville

Jackie Chan fights two villains who fit the trope, first one at a time, and then both at once in the finale of Who Am I?
Jules and Vincent (pictured, played by Samuel L. Jackson and John Travolta respectively) from Pulp Fiction.
The two NSA agents played by Hank Azaria and K. Todd Freeman in Grosse Pointe Blank are sort of a marriage of this trope and the traditional Salt and Pepper buddy cop pairing. Martin Q. Blank (John Cusack) and Grocer (Dan Aykroyd) also fit somewhat, although they are rivals.
Pintel and Ragetti from Pirates of the Caribbean, who happen to have good guy counterparts in the Royal Navy. By the third film, however, these roles are reversed.
Mr. Frying Pan and Mr. Fire from Kiss Kiss Bang Bang. (Their actual names aren't given, but this is what they are listed as in the credits.)
The Matrix
- Going off of the Men In Black reference above, those characters in general have a similar dynamic as this type of character, and the Agents are a particularly good fit. There's three of them instead of two, but that hardly matters.
- The Twins from the The Matrix Reloaded probably also count. While they don't really exposit much, they do provide some amusing dialogue, talking to each other in an unconcerned deadpan while being shot, and taking part in a highspeed car chase.
Cohen And Tate
Sydney Greenstreet and Peter Lorre were sometimes teamed up this way after The Maltese Falcon. Subverted by their cameo in Hollywood Canteen, where after Lorre asks a man if he "would like to step outside for a moment", he innocently tells Greenstreet "I was only going to ask him if he wanted a cigarette".
Showalter and Grimsrud in Fargo.
MasterBlaster, the duo who run Underworld in Mad Max Beyond Thunderdome ("They are a unit; they even share the same name"). Master is a mental giant with a body like a small child's; for Blaster, the reverse is true.
4-Lom and Zuckuss in Star Wars. The pair even loses face when forced to work with a third bounty hunter in the hunt for the Yavin Vassilika.
Possible Real Life example: Burke and Hare. Their cinematic versions in 1960's The Flesh and the Fiends definitely fit (and Donald Pleasance is particularly Faux Affably Evil as Hare).
The Wet Bandits in Home Alone.
Mr. Wint and Mr. Kidd, in the James Bond movie Diamonds Are Forever. They have a strange habit of dispatching everyone else in the diamond smuggling ring and tried to off James Bond three times: once by leaving him to meet a fiery end in an incinerator; again by leaving him to rot in a pipeline; and the third and final time by appearing to him in person disguised as the cruise ship's kitchen crew.
Jacko and Dwayne, the bumbling escaped convicts in the incredibly lame and Narm-riddled The Legend Of Wolf Mountain.
Spike and Iggy in Super Mario Bros.: The Movie.
Budlofsky & Matheson from Pineapple Express.
Snatch: Bricktop has a pair of thugs, Errol and John, who function like this.
Agent Johnson and Agent Johnson, from Die Hard, count, even if they're not technically bad guys.
Howard and Eli from the Video Violence duology.
The Joss Whedon / Drew Goddard film The Cabin in the Woods has Hadley and Sitterson, who provide much of the film's humor as well as its most interesting characters.
Ira and Ralph (played by Zack Norman and Danny DeVito, respectively) from Romancing The Stone.
Scrad and Charlie from Men In Black II.
Leonard and Willie (Damon Wayans and Kadeem Hardison) in I'm Gonna Git You Sucka are two bad guys who work for Mr. Big and spend the movie trying to kidnap and murder, but mainly be idiots. One is dumber than the other...but only slightly. They always end up getting beat up and having to decide between going out the window or down the stairs.