Sylvester Stallone ‘put a little knife’ in daughter Sistine’s backpack in fourth grade for self-defense

Sylvester Stallone takes self-defense very seriously.

The actor — who shares three daughters with wife Jennifer Flavin — once gave their middle child, Sistine, a “little knife” to take to school.

“He made us practice pepper spray each other,” the 25-year-old revealed in a confessional interview during the Season 2 premiere of “The Family Stallone.”

“Oh my God, that’s so bad. He put a little knife in my backpack in fourth grade.”

Elsewhere in the episode, the “Rambo” actor, 77, took Sistine and her sister Sophia, 27, to learn self-defense with Defense Strategies Group.

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“I’m not playing a game,” he told his daughters, who both live in New York, about the self-defense class.

“These are the guys that have seen combat, faced death. This is the real deal.”

During the training session, the two teachers — who were former Navy SEALS — threw punches with the girls while wearing Boxing gloves.

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However, Sophia was skeptical as she asked them, “When am I ever going to be doing this in New York?”

“Every first date ever,” Sistine told her.

In fact, Sistine almost got a date out of the self-defense class, revealing one of the trainers messaged her on Instagram.

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“But I’m not his type and I’ll tell you why. He follows only girls that have really big curves,” she said of her “stick figure” body type.   

Sylvester later noted that he and Flavin are permanently relocating to Palm Beach, Fla., to be closer to their youngest daughter, Scarlet, 21, who attends the University of Miami.

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“After long, hard consideration, your mother and I have decided, time to move on and leave the state of California permanently, and we’re going to go to Florida,” the “Rocky” star told Sophia and Sistine.

“I don’t want to shake things up, but I know my wife wants big adventure,” he went on, noting that he “owes it” to his wife to “go through this move.”

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During the conversation, Flavin, 55, reasoned their home “is an empty nest.”

“I need to change it up … Being empty-nesters, we can get into a lot of trouble together,” she said.

The “Expendables” actor is also dad to two sons with his first wife, Sasha Czack: Seargeoh, 44, and Sage, who died of coronary artery disease in 2012 at the age of 36.