Yep..Bubba does the same thing, about twice a day. Usually it's after he goes out and takes a poo. I call it his 'wild hair'. Just stand back and for about 5 minutes he's a wild man! He also does it right before he takes a long nap. Right after he calms down..he's out snoring and dead to the world! The only thing I can tell you is that when he gets into those moods, make sure your kids know that they should stay away and be sitting down. Poor little guys!