Warner Bros.

The Cast Of 'Vacation' Tells Us About Their S--ttiest Day On Set

What a turd.

With reporting by Nicole Pajer

Being an actor in a major movie isn't all fun and games. Sometimes, in fact, it's straight up s--tty. Just ask the cast of "Vacation."

The upcoming remake has a scene that's been featured heavily in trailers and promos, one that finds the Griswold family (Ed Helms, Christina Applegate, Skyler Gisondo and Steele Stebbins) enjoying what they think is their own private hot springs, a hidden gem from mother nature. Instead, it's a raw sewage dump, as they discover while scooping syringes, full turds and more waste out of the bottom of the pit.

Not the idyllic family fun they'd imagined, to say the least.

MTV News caught up with the cast and directors of "Vacation" to get the scoop on filming the scene.

Co-director Jonathan Goldstein said that the cast only had one day to film the whole sequence.

"We didn't really have a lot of time to mess around with the scenery and get really loose with it," he said. "We were on a tight schedule. We had to approach it in a very clinical way."

In other words, once the mud was on someone, it wasn't coming off.

But was it...really...mud?

Nobody could be totally sure.

"I don't know what it was made out of, but there was some pretty weird stuff in there," Stebbins said. "At one point I was throwing dirty diapers at him. Any dirty thing they could think of to put in there, they put in there. Whatever grossness they could imagine found its way into that hot springs."

Gisondo, who played his older brother, agreed.

"There were fake pieces of poo in there that looked really realistic and we're not entirely sure they were fake," he said. "We certainly hope so."

Star Helms said that he'd made sure it was the real deal.

"I'm very method, a stickler for authenticity, so I insisted that we use all real feces," he said. Just kidding. "That's a very polarizing joke, some people really think it's hysterical, others are just like no thank you."

Applegate fell firmly into the "hysterical" camp.

"You either think poop is funny, like a four-year-old, or you think poop is funny. I think it's funny. I'll talk about poop all day," she said.

Co-director John Francis Daley set the record straight once and for all: "It was mud."

"Vacation" is in theaters now.