Ichi the Killer

In a flashback, Ichi masturbates on an apartment balcony while watching a pimp assault a prostitute within. Off-camera, sadistic crime underboss Anjo is brutally murdered. An expert cleaning crew run by Jijii (Shinya Tsukamoto) immediately removes any trace of Anjo's remains, and credits Ichi for the kill. Later, Kakihara (Tadanobu Asano), Anjo's sadomasochistic enforcer, and other crime lords visit the spotless apartment, concluding that Anjo fled town with the prostitute and ¥3 million of the gang's money. Read more on Wikipedia.