The actor was visiting his mum Valerie in Modesto when a violent storm swept through the area, sending a 50-foot (15-metre) tree tumbling to the ground and onto the home he had recently purchased for her.
He tells the National Enquirer, ""I heard lots of noise and craziness. And I felt branches and broken glass on my neck, so I started running - even though I wasn't really sure what I was running from.""
Fortunately The Hurt Locker hunk's mother was not at home when catastrophe struck.
Valerie adds, ""Jeremy is my real-life hero - I'm so proud of him. I wasn't at home when it happened, but I'm sure he would have saved me.""