Matt Groening (C), creator of The Simpsons, poses with characters from the show
Matt Groening (C), creator of The Simpsons, poses with characters from the show (L-R) Homer, Bart, Lisa, Marge and Maggie at the 20th anniversary party for the television series at Barker hangar in Santa Monica, California October 18, 2009 Reuters/Mario Anzuoni

Parents are becoming more cautious about the things that their young children are watching on TV. Despite the great animation and funny lines, some of these cartoons actually showcase restricted content every now and then.

1. "Ren and Stimpy"

In an article by Thoughtcatalogue.com, the slapstick duo on Nickelodeon might initially look harmless, featuring scenes where they try to hurt each other in funny ways. However, a lot of parents noticed later that the show included profanity and sexual messages. When either character gets angry with the other, they start sharing morbid and violent ideas on how to make the other pay, which would normally involve eye-gouging, lip-tearing and teeth-drilling, among other things.

2. "Family Guy"

The show focuses on the life of Peter Griffin and his family in the fictional city of Quahog in Rhode Island. Parents should watch out for animated shows created by Seth McFarlane because of its dark sense of humor. Advertisers of the show even cancelled their contracts after finding the plot and lines unsuitable. Many viewers criticized the cartoon for being racist, discriminatory on religion and indecent.

3. "South Park"

The cartoon is actually described as an adult animated sitcom, primarily intended for mature audiences. The story features four boys and their special adventures around Colorado town. A writeup on Complex.com states that the show gained popularity because of its dark humor and harsh language. Most statements by any of the four characters would include profane words and curses. Even the background music includes profane lyrics at times.

4. "American Dad"

Similar to "South Park," "American Dad' is described as an adult animated sitcom. Although it is subtler compared to "South Park," the kind of humor is still dark and surreal. Many times, the cartoon would attack pop culture and even hint on ideas of sex, racism and religious discrimination. Stan Smith is the main character of the show, which follows how he deals with work and family on a regular basis.

5. "The Simpsons"

For many years, parents have been criticizing the show because of its harsh language and attacks on American culture and history. According to The Business Insider, Fox Broadcast show even referred to the cartoon as "Unsuitable for Viewers Under 75." The show is about the Simpsons and their family dynamics, which usually includes talking to and dealing with each other in a violent and discriminating manner.