Ninja III: The Domination (1984)

The body of a sexy aerobics instructor is invaded by the evil spirit of a dying ninja. At first, changes in her behavior is limited to having strange interactions with an arcade game, doing sexy things with V8 juice, and being attracted to an unusually hairy police officer. But soon enough, she's systematically killing, ninja-style, the officers responsible for the ninja's death, and can only be stopped by another ninja!