Harold talks about different ways he could kill people while fighting in the military (strangling them, slitting their throats, etc) and gets excited about the idea. He also talks about keeping body parts as souvenirs, including "private parts". This is supposed to be played for humor- he doesn't really mean those things or do them and is just saying it to scare someone.
There are several "comical" suicide scenes, played for laughs including hanging, stabbing, self-immolation, and character pointing a gun at his own face. Some of these have some blood and are depicted realistically.
A nude painting depicts a rape scene from mythology. No details are shown.