The dream that frightened me awake

Hollywood, please make this movie. I'll sell the idea cheap.

I was in a lovely yard, admiring an oak, when suddenly a great bough cleaved off and fell to the ground. The branch became dust, revealing that most of its mass was actually insects, now swarming angrily above. I turned to run and they chased me en masse. I fell and was soon encrusted. As they devoured me I realized I was the first person in the world to discover that man-eating space termites were inside our trees.