UFO Sighting in Vimperk, South Bohemian Region on July 8th 2015 – Big bright (1/4 size of the Moon!) and really fast light

I was standing in the dark night and smoking a cigarette, suddenly a big bright light (1/4 size of the Moon) went horizontally over the horizon... I was behind the trees, so I didn't see the whole path, but when i ran to a higher place for better view, it just disappeared. The event took approximately 10 secs and scared the sh*t out of me :-)