been banned from certain countries for their violent content. Snuff films take horror to its furthest extreme as torture and murder are not simulated. Violence in films is not an old topic, recently a study presented in an annual American Academy of Pediatrics conference showed that the "good guys" in superhero movies were on average more violent than the villains, potentially sending a strongly negative message to young viewers. News media News media on television and online video frequently cover violent acts. The coverage may be preceded with a warning, stating that the footage may be disturbing to some viewers. Sometimes graphic images are censored, by blurring or blocking a portion of the image, cutting the violent portions out of an image sequence or by removing certain portions of film footage from viewing. Music videos Graphic and gory violence has started appearing in music videos in recent times, an example being the controversial music video for the song "Rock DJ" by British rock vocalist Robbie Williams, which features self-mutilation. Another example of a music video containing strong violence is the music video for the song "Hurricane" by American rock band Thirty Seconds to Mars and "Happiness in Slavery" by American industrial rock group Nine Inch Nails. The music video for "Forced Gender Reassignment" by American deathgrind band Cattle Decapitation displays such intense graphic violence that it is not hosted by many popular video hosting sites like YouTube and Dailymotion and is only hosted by Vimeo. Video games Violent content has been a central part of video game controversy. Because violence in video games is interactive and not passive, critics such as Dave Grossman and Jack Thompson argue that violence in games hardens children to unethical acts, calling first-person shooter games "murder simulators", although no conclusive evidence has supported this belief. An example is the display of "gibs" (short for giblets), little bits or giant chunks of internal organs, flesh, and bone, when a character is killed. Internet On the internet, several sites dedicated to recordings of real graphic violence, referred to as "gore", exist, such as Bestgore.com and Goregrish.com. Furthermore, many content-aggregator sites such as Reddit or imageboards and 4chan have their own subsites which are dedicated to or allow that kind of content. Some of those sites also require that gore material to be marked as it, often by the internet slang "NSFL" (shorthand for "not safe for life").