Today Isaac and I were playing tag, and he decided to suddenly turn around while I was chasing him on all fours and run head-on into me. I was laughing, expecting him to slow down before he hit me, but nooooo--he ran straight into me with my mouth open. He now has two big teeth imprints in his forehead, and I had to run to a mirror to make sure he hadn't knocked out my front teeth because he ran into me so hard. His reaction? He just laughed because he got momma.