Mark Corallo took his wife and son to see the movie version of “Land Of The Lost” and was surprised to learn that Hollywood had managed to ruin the whole television series of our youth.

“All you need to know is that I was compelled to ask, ‘What the heck is this rated?’ within the first five minutes of the movie,” Corallo wrote in a review for Big Hollywood. Forty minutes later, he and his family left the theater in disgust at the endless promotion of sexual perversion and foul language.

I feel for the man. I loved the TV version of “Land Of The Lost” and would love to take my kids to a movie remake, like we did two years ago when the cartoon “Underdog” went Hollywood . But he shouldn’t have been surprised at the trashiness of the movie.

All I needed to know to convince me to stay away was that Will Ferrell was in the movie. Ruining “Land Of The Lost” is par for the Ferrell coarse.

His frantic comedy shtick is tiresome and usually vile. Even his relatively child-friendly movies, like “Elf” and “Kicking & Screaming,” push the envelope of decency.

Both Ferrell’s choice of movie scripts and the exclusive content at the Funny or Die video-sharing site he co-founded make clear that he has no morals. “The Landlord” skits on Funny or Die starred a 2-year-old girl who was trained to swear on cue and portrayed as a beer guzzler.

Why would anyone pay money to be “entertained” by Ferrell?

Sadly, too many parents are willing to take their kids to watch his kind of filth — or worse, to drop the children off at the movie theater and let them pick which flicks to watch.

Corallo is wrong to hope that most 11-year-olds, like his son, will “have the guts to get up and walk out on the crap that Hollywood has grown accustomed to shoveling at them.” They won’t. Parents need to lead them in that direction, and too many are shirking their duties. Otherwise, Hollywood wouldn’t even be producing Ferrell-like garbage.