Bokeh effect on the camera. How to do.

Yesterday, I unexpectedly photographed the bokeh effect on the camera.
I began to understand why it happened and how to repeat this interesting effect. And that's what happened:
You need to focus the camera on a bright light source. I focused the camera on a bright moon. But you have to focus the camera not to the end. Then you have to move the camera to the street lights and press the shutter button.