Timothée Chalamet says “Interstellar” was his all-time favorite film to work on but revealed that he received quite the jarring surprise during his final day on set thanks to his co-star Matthew McConaughey.

While discussing the 2014 sci-fi drama with Variety in a Feb. 21 joint interview with McConaughey, the “Marty Supreme” star spilled the beans about a stomach-churning prank that the Texas-born actor played on him, which McConaughey described as a “coming of age” moment.

“I gotta say, my last day on ‘Interstellar,’ I was sad to be leaving. In my trailer, I went to the bathroom and there was a huge turd in my toilet,” Chalamet began.

Admitting that the gross antic left him feeling “so disrespected,” he continued, “Like, I know I’m not the star of this movie, but who’s coming in here? So I went around to all the grips, these big guys, and I said, ‘Hey, one of you let it loose in my trailer.’ They said no.”

The now-Golden Globe winner then shared that the film’s director, Christopher Nolan, was in on McConaughey pulling the stunt.

“I went up to Nolan, and he pointed to Matthew, and Matthew had this devilish grin on his face. I said, ‘Why’d you do that?’ You said, ‘In Texas, it’s a coming of age, baby.’”

After Chalamet recalled the incident, the Oscar winner jokingly referred to the poop as a “souvenir,” to which the American-French actor replied, “That’s a true story.”

While Chalamet ultimately made light of the stinky prank, social media users on X weren’t so easygoing about it.

“That’s hilarious. if you’re twelve,” one person said, while another straight up called the act “disgusting.”

Someone else added, “This is not it!!! I am not laughing AT ALL Matthew.”

Other X users were amused by the gesture.

“Christopher Nolan pointing straight at Matthew while he grins might be the funniest part of this whole story,” one person wrote.

Quoting the “Dallas Buyers Club” star’s signature phrase, someone else wrote, “McConaughey really said ‘alright, alright, alright’… and left Timmy a Texas souvenir 🚽😂.”

Another called McConaughey’s prank a “weird honor,” adding, “You gotta respect the commitment to the bit, even if Timothée Chalamet probably didn’t feel that way in the moment.”

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