The John CaldwellChurch of Scientology didn't have mercy when it came to John Stamos. 

The Full House star recalled his experience being recruited by the infamous institution as a teenager and why he was ultimately told to leave.

"I was in this acting class and there was this hot girl," John explained on the Friend in High Place with Matt Friend podcast Aug. 25. "She said, 'We're all meeting at this address on Hollywood Blvd. Come after.' I was working at my dad's restaurant at the time. I was like, 'Dad, I've got to go.' I was 16, 17." 

"I went and it was the Scientology building," he continued, "They brought me in there and there was this guy who told me, 'Come over here.'"  

John explained that he was handed an e-meter, a device used by the church that uses two metallic cans to measure electrical currents through the person undergoing the auditing process. "You're holding these two cans," he added, referring to the cartoon Rocky and Bullwinkle, "I started [saying], 'Hello, Peabody in the Wayback Machine!'"

As for how the Church of Scientology officials reacted? 

“They didn’t like that,” the 61-year-old admitted. “I was just f--king around so much that they said, 'Get out. Get. Go.' They just kinda kicked me out." 

E! News has reached out to the Church of Scientology for comment and has not heard back. 

The Big Shot alum previously shared insight into his Scientology experience, noting in his 2023 memoir If You Would Have Told Me that the woman who invited him also handed him a book "the size of a brick."

"There's a lot about control: controlling your reactionary mind, controlling energy, controlling space, and controlling time," John wrote of the book, per Entertainment Weekly. "Where's the part about acting? And who's this L. Ron Hubbard guy who wrote a bunch of his opinions in here?" 

He also described the church's building as a "grand, ornate, and creepy as f--k—a cross between Chateau Marmont, Disney's Haunted Mansion, and a mental hospital."

In his memoir, John also noted that the man doing the audit began "to question me about committing crimes, asks if I have negative thoughts about Scientology or L. Ron Hubbard (the founder) and probes into some strange sex inquiries."

"I am whisked out of the room and sent on my merry way," he concluded in his book. "Apparently, I'm not Scientology material. Darn it."

For the latest breaking news updates, click here to download the E! News App