So I was watching this Hong Kong movie called "Tokyo Raiders" and there are some interesting KO scenes. They both involve the incredibly hot actress Kelly Chen (who plays a character named Macy). The first scene is a drugged drink. She sits in the office of some dude who offers her drugged coffee. The coffee was drugged with some sort of hypnotic substance that caused her to feel sleepy yet she was able to respond to the man's questions. The sequence lasts for a really long time, with lots of sleepy shots. It's a pretty good scene.
There's even more. Kelly Chen is riding in the car with another guy and he tells her "hey look over there!". The guy then hits her in the neck causing her to fall asleep. I stopped watching the movie after that, because it was a pretty bad movie.