I was staring at my window before going to bed at night and I was on the phone at the same time, I suddenly saw a light falling from the sky. First, I though that it was a plane but it came closer and I realized that it was something like a fireball. I shouted "It's going to fall on the roof and it'll exploit" to my friend on the phone and I stayed there to watch if anything burns. Nothing burned, it landed on top of the roof and the lights/fireball effect disappeared. It was moving like it's falling, but it was not something like falling. It was straight-line path and planned landing, I'm sure. I was shocked and frozen, I still am though.