Seth MacFarlane's "A Million Ways to Die in the West" has a million ways of grossing you out — but even for MacFarlane, there's one gag that was too far over the line.

Speaking with MTV News, MacFarlane, who wrote, directed and starred in the R-rated "Million Ways," pulled the curtain back on one scene that didn't make the final cut of the Wild West era comedy.

"There was a scene in the doctor's office, where we see a frontier era surgery taking place," said MacFarlane. "The doctor gets up and leaves for a moment, and his cat jumps up on the table and makes off with an intestine."

"It made us laugh on the day, but it didn't quite [work]," he laughed. "I think people were so horrified by it. 'We get that you're portraying this as such a rough, awful place to live — which it was – but we don't want to see a cat eating somebody out from the inside.'"

Even Charlize Theron, MacFarlane's co-star, was horrified by the scene. "If I'm going to say something is too much for me, then it must be pretty f—ed up, because I'm pretty okay with a lot of stuff," she said.

Indeed, Theron's comments are coming from an actor who, at one point in "Million Ways," inserts a daisy into… er, into an…

"Into an a—hole," Theron clarified. "Yes, I did. Several times. Because I'm a professional, and I wanted to get it perfect. I'm a perfectionist."

Glad we got that covered.

"A Million Ways to Die in the West" is in theaters now.