It's Pitiful

Over the past, I'd say 2 weeks maybe, Jake has started something new, and it's just pitiful.  He's been loving head butting.  Now, when he's upset or frustrated, he gets into a low crawling position or just all the way on the floor, and starts banging his head on the floor (or sometimes substitutes the wall, or my chest/head if he's crawling around on me...I have to be careful that my nose isn't in the way!).  It's just pitiful to watch, especially when he does it on something that's harder than he realizes, like the driveway.  Ouch!  Pitiful :(