Arthur stabs a man twice, once in the throat and then in the eye with blood spraying everywhere, then rams his head repeatedly against the wall 11 times, leaving a giant blood splatter. This is without a doubt the most violent part in the movie, although it's not too detailed due to the quick editing. Nonetheless, this scene along with the language is the main reason for the R rating.
A man is shot by a police officer on the subway. No blood seen.
Violence is a theme throughout most of this film, people are shot in the head on a few occasions, with blood splattering. It's not quite horror film levels, but some scenes are particularly shocking.
The film contains a few shootings and stabbings with brief injury detail. While it's not excessively bloody or gory, it's in your face when it happens and mostly used for impact.
The violence is realistic and quite strong, but it isn't very detailed. There's no gore and the blood sprays are mild to moderate, and we also never really see any wounds or injury detail other than the bloodshed present.
Total of 13 kills in the movie, 1 being implied. 7 gun kills, 1 stabbing kill, 2 in a car crash, and one suffocation. Kills are very realistic and graphic.
In the opening scene Arthur's sign he's holding is stolen by a group of young kids. After chasing them down they hit him in the face with the sign and kick him on the ground over 10 times.
The joker is a serial killer in the movie.
Strong disturbing bloody violence.
3.5/10 for gore.
7.2/10 for violence.