Headbanging

Evan keeps banging his head on my head (which is cute, but HURTS), chest, our legs, etc!  I'm not sure if it's because he's tired, or because we kiss him so much and it's his way of kissing us?  He usually has his tongue out when he's doing this.  Also, he sticks his tongue out when we kiss him, which we're going to have to teach him not to do, because that's going to get creepy at some point.  :)