Justin Cooper was eight years old when he began experiencing the not-so-friendly side of fame.Cooper, who starred as Jim Carrey's son in the 1997 comedy "Liar Liar," revealed one dark side of the business during an appearance on the "Not So Little Rascals" podcast.The "Brother's Keeper" actor told co-hosts Jordan Warkol and Blake Collins that his mother did a "really good job" of protecting him from the outside world while growing up in front of the cameras, but that there were still scary moments associated with fame.'GROWING PAINS' CHILD STAR ASHLEY JOHNSON REVEALS 'DARK' MOMENT ARMED FAN TRIED TO ABDUCT HER FROM SETJustin Cooper worked alongside Jim Carrey in the '97 film "Liar Liar." (Everett Collection)"She would tell me later on about, like, prison mail that I would get that she never showed me," Cooper said before explaining that he would receive "letters from people in jail."'BOYHOOD' CHILD ACTOR LIVES 'IN THE MIDDLE OF NOWHERE' AFTER LEAVING HOLLYWOOD BEHIND"Dudes in jail talking about how they're such a big fan of me ...and you're such a cute kid," he remembered.Cooper praised his mother for protecting him during a pivotal time in his career, and noted that she "never, ever left me alone with anybody on set."Carrey portrayed a pathological liar-lawyer who couldn't tell a lie for 24 hours in the comedy "Liar Liar." (Universal City Studios)"You know, there's a lot of acting parents that you hear of back in the day that are just like, 'OK, ya, go.
Do whatever they tell you to do.Bye!' and my mom was not like that," he said.
"Almost to a fault."PUT YOUR ENTERTAINMENT KNOWLEDGE TO THE TEST AND SEE HOW YOU SCORE"I remember a story that just blew my mind.So Don Rickles played Mr.
Wilson in 'Dennis the Menace Strikes Again,' and he's known for being a, you know, foul-mouthed comic," Cooper recalled."She went up to him and, is like, 'I don't want you to use any language like that in front of my kid.'"During the peak of his fame, Cooper appeared on "The Tonight S...