I was outside smoking a cigarette when I noticed a voilet light moving across the clouds from west to northwest. This happened for about 4 minutes. The beam was the same as a spot light but the light was not coming from the ground. The light seemed to be coming from above the clouds above my neighbors house. I didn't see anyone with a flashlight or any type of light pointing at the sky. I called my son to see if he noticed anything unusual about the sky and he immediately that the light was coming from above the clouds.