Mac and Plac is a short film written and directed by Harmony Korine in 2010. The film is made of footage that was not included in Trash Humpers (2009).

In a questions-and-answers sessions following a screening at Cinema Village in New York in May of 2010, Korine explained the origins of Mac and Plac:

It’s a play I wrote when I was eighteen. It’s a play where the two guys are in the basement talking with the conjoined twins. I wrote it right when I was eighteen. I think it’s a really great play. It’s actually called Mac and Plac are the Wonder Twins Deactivated. The reason they called the guy Mac was because he was obsessed with Camaros and “CAM” spelled backwards is “MAC.” The other guy was called Plac because he was born with one fully formed tooth and it was very dirty. It was a whole thing about how they were so close that when would get nervous his butterflies would fly into the other one’s stomach.
Further details were given in an interview with Slash Film published May 1, 2010:
See what happened was, Mac and Plac are the Wonder Twins Deactivated was a play I wrote when I was 18, and it was about conjoined twins and I wanted Harrison Ford to play one of the twins on his knees. And I guess, at that time, it was very difficult to get him the script, the play. Basically, there was a scene where the twins are in a doctor’s office, and they hate each other, and they want to cut loose. So, one of them takes a plastic carving knife and starts... So, it’s a story and I never got it off the ground. And I had really high aspirations for Mac and Plac. They call one of the twins Plac because he was born with a fully grown tooth that was covered in plaque. And the other one, his real name was Roger but he turned his name into Mac because his favorite car is a Camaro, and Mac spelled backwards is C-A-M. They hated each other.

There was this great scene where they are about to get split in half—they’re getting this appendage removed—and one of them goes, “I can tell you’re nervous,” and the other one goes, “How?” And the other one says, “Some of your butterflies just flew into my stomach.” Can you imagine? You’re so close to someone you can feel their butterflies fly into your stomach? That’s something I had written almost 20 years ago, but the only thing it has in common with Trash Humpers is the scene when the two guys put a play on in the basement, and some of those lines and monologues are taken from the play Mac and Plac.
Mac and Plac is included as an extra on the DVD release of Trash Humpers.