In July 2008, the ocean entry plume at Kalapana, Hawaii erupted with a spectacular display of lava, ash, and dark-clouded fury.
But within those eruption clouds was something else entirely: Lightning.
Apparently, this is a fairly common phenomenon, though it’s rare in Hawaii. It occurred due to “unusually dry conditions.”
The lightning is clearly visible, especially during the night shots, in the above video (beginning at about the 2:00 mark).
You can read more about lightning in volcano eruption clouds — and the 2008 Kalapana area eruption in particular — at the Center for the Study of Active Volcanoes website.