This is a spectacular video of Mount Sinabung spitting lava. Or how terrifying nature can be!
They describe their video as:
Animation shows pyroclastic flow at Mount Sinabung, Sumatra. Further, a close-up of the lava lobe is shown including the collapse of the lobe front leading to a pyroclastic flow. Movement of the lobe prior to collapse is just about visible.
That thing was really huge—it looks like the lava ran for more than a mile before stopping.
Read more about the Indonesian volcanos’s activity over at Photovolcanica.