Ichi the Killer is an immense film by a great director and all his work has that kind of reaction i believe.
As you watch it then whilst watching it your like wow this is quite gross (think to yourself how did this make it on to dvd) but keep watching, then he usually adds in some sadistic scenes and your like omg omg turn this off, but keep watching then it ends and your like wow pretty good film.
Try watching Visitor Q, you will understand entirely what i mean
