People often assume the original Teenage Mutant Ninja Turtles comic book series is for kids, since the cartoon series is so watered down, but the TMNT weren't afraid to get their hands dirty in the comics.
After all, Master Splinter did train the boys to be ninjas, so they should know more about chopping heads than sewer surfing, and yet there's very little blood shed in a TMNT film...until now.
(NSFW due to language and violence)
Ninja Turtles: Veterans of the Night was created by TheMigmeisterPro (Miguel Diaz-Rivera) as his art school thesis project, and it already looks a heck of a lot better than the Michael Bay version!
-Via Polygon