There are some dangerous situations such as gunfights, fist fights, Moe threatening people with weapons such as guns, knives, etc.
Some episodes feature blood and gore.
Non-dramatic comedic slapstick violence may occur throughout the show.
Throughout the show, whenever Bart does something rude, inappropriate or annoying, Homer would start strangling Bart and then he says "Why, you little...!" This is a running gag and is intended to be funny, but it may disturb some viewers.
In the annual Treehouse of Horror episodes, over the top, extremely gory horror-violence is often shown.
One episode shows a kid assaulting a mailman, at the end of the short scene, the kid slits his throat with a letter. A little blood is shown.
The older episodes have nothing more than some scrapes and a little blood, but most seasons around the teen seasons have more gore.
Barely any grown man such as Homer is shown strangling his son a lot in the series, but it's not violent and played for comedic effect.
A decent amount of episodes a season are gory and bloody
Unnecessary violence but it's funny
Very cartoony and funny, blood murders and su*cide references in there Halloween specials but it's more funny then scary or gory but kids might find it gory.
Many episodes contain comic animated violence, including blood.
A show-within-a-show, titled "Itchy & Scratchy", itself a parody of Tom and Jerry, includes uncompromising scenes of violence, including blood, gore and viscera.
The annual Treehouse of Horror episodes (which are non-canonical) also contain such violence, but often involving more prominent characters of the series. These episodes generally contain instances of over-the-top bloody violence (including images of gore, viscera, decapitation and mutilation).
While violence on the show is cartoonish and intended to amuse, as opposed to horrify.