It's the battle of the face plants as Mark and Dayna duke it out in today's Video Wars!

Mark's pick is stair-surfing at its best -- a kid attempts to slide down steps in a laundry basket... and tumbles into a wall. The star of Dayna's stair vid -- an amateur skateboarder who gets a taste of concrete!

Tell "Extra" -- which stair debacle had you laughing more?