Arnold Schwarzenegger's new movie has him facing the one thing he fears most: singing

Saban Films

Arnold Schwarzenegger in "Killing Gunther."

• Arnold Schwarzenegger plays an assassin in "Killing Gunther."
• He does a lot of outlandish things in the movie, including singing a country music song.
• Schwarzenegger said he did "freak out" when he learned he had to sing on screen.

There aren't many things Arnold Schwarzenegger will admit that make him feel vulnerable.

The 70-year-old action movie icon, who's also a former Mr. Universe and governor of California, has played the tough-guy persona for decades. But in his new movie, "Killing Gunther" (in theaters and available on streaming), there is a moment that Schwarzenegger admits he did "freak out" over doing: singing. A country music song, to be exact.

"I don't mind looking foolish but it's just that I'm so bad at singing," Schwarzenegger told Business Insider. "The only time people ask me to sing is if they want the party to stop. If they want everyone to go home. Immediately."

Schwarzenegger plays Gunther in the movie, the world's best assassin. "Saturday Night Live" alum Taran Killam leads a group trying to track down Gunther and kill him (Killam also directed the movie). In the faux documentary-style action/comedy we are given a glimpse into Gunther's fabulously outlandish life. Along with showing off his wacky outfits and other accessories he also reveals one of his hobbies: singing. He explains that he has a recording studio in his home and loves recording country music songs. The scene then cuts to Gunther in a recording booth singing a song.

That's right, Schwarzenegger, singing country, and also dressed like he's about to go to a rodeo.

"I just don't have an ear for music," said Schwarzenegger. "That's why for 'Twins' Ivan Reitman made me sing so people would laugh. So, I get it. It's embarrassing."

And there's nothing more funny than a guy with an Austrian accent trying to sing country. Make sure to stick around for the closing credits of "Killing Gunther" to hear Schwarzenegger's entire song.

Here's Arnold singing in "Twins."