Let me start off by saying I first watched this movie when my mother taped it on TV when I was around 8. I loved it, and still do. Back then, bad words were dubbed so there was nothing bad I remember hearing. I bought the movie on DVD some years ago and I seriously cannot believe how much bad language is in it!!! Especially for a movie targeted towards kids. But - the movie is very fun and entertaining. Little brother Eric (Played by Ben Savage) hears noises and sees shadows in his bedroom which have him screaming half the night. He convinces his older brother Brian (played by Fred Savage - Ben's real-life brother) to switch bedrooms with him so he can prove there really are monsters. From there on, Brian discovers a real-life monster under his bed (Played by Howie Mandel). The two soon become best friends when Maurice the monster introduces Brian to his secret under world where only monsters rule. In monster world, there are no rules or adult supervision. After spending most of his time with Maurice, Brian learns that he is actually turning into a monster himself! Now the language is persistent (lots of uses of the word sh*t by kids, holy sh*t, p*ss, hell, b*tch, @ss, goddamn). Sexual references (Maurice pulls Brian's pants down and a girl monster says "Nice @ss!) some references to sex but not too graphic (like playing with yourself, a man's best friend is his right hand, reference to the playboy channel...etc) a boy crushes on a girl. Lots of violence (kid gets his eyes pushed in and his head ripped off, kids get bullied, violent monster play, explosives, monster pees in a school boy's apple-juice bottle, kids play pranks on each other...etc). The scare factor is huge for youngsters, it's super scary with frightening situations (a new born baby is terrorized by scary monsters for fun), the Master Monster "Boyd" is very scary and mean. Overall, the film is super funny and cool but the bad stuff is mainly humorous and fantasy - probably overlooked by most children. Watch it first before letting your young ones see it. For mature ages 9 and up but better targeted toward tweens and teens!