Examples of the Straight Man from live action films.
The 40-Year-Old Virgin: Steve Carell as the eponymous character. However, his role has some overtly comedic moments, as in the famous body-waxing scene, in which it's the ladies doing the waxing who are playing the "straight man" role.
In an innovative Subverted Trope, this film had no comedic actors; in effect the entire cast was straight men reacting to the ridiculous situations they're put in (except Johnny, the fruitloop in the control tower). Yes, even Leslie Nielsen. Before Airplane!!, he primarily acted in horror B-movies One journalist even went so far as to say that Nielsen's job description was unchanged for his early dramatic roles and the comedic roles which he became better known for: both hinged on his ability to say completely ridiculous lines with a straight face.
David Spade: Played the straight man to Chris Farley in a couple movies, notably Tommy Boy and Black Sheep (1996). The duo had planned to do more films in this fashion, but due to Chris Farley's passing this never happened.
Margaret Dumont, the classic foil for the Marx Brothers, especially Groucho. Her characters were often derided as stuffy and humorless, but that's exactly the point.
Zeppo Marx himself was a straight man for his brothers, as he had a non-comedic stage persona, but all the requisite timing and skill. After Zeppo's departure, other actors (such as Allan Jones in A Night at the Opera and A Day at the Races (1937)) would take the role.
Star Wars: C-3P0 acts as this to R2-D2, while also providing the audience of some idea of just what is being said by his otherwise unintelligible friend.
Larry, since his style of humor was often to merely react to the extreme characterizations of Moe and Curly (and later Shemp).
It is probably more accurate to say that the miscellaneous guest actors in the shorts constituted the straight men, who (like the supporting characters in Marx Bros. films) are there to act appalled at the comedians' antics.
Withnail and I: In a less obviously comedic example, Paul McGann as Marwood/"I" plays a pitch-perfect straight man to Richard E. Grant (Withnail), grounding his manic performance in a solid emotional reality; the film wouldn't work nearly as well as it does without him.
Clue has, for irony’s sake, the man being blackmailed for being gay, Mr. Green.
