I hit my head

Mommy and I ran to giant real quick to pick up a few items for dinner. I was really good until the very end when I decided to run from her in the store. As I was running, she was yelling out be careful Cody, watch where you're going and don't run in the store. I thought it was funny. I mean what harm was I doing. It wasn't like I was that far ahead of her. I was looking back the entire time as I was running. Finally I turned around and BAM! I ran right into a grocery cart and hit my head. Of course I started crying and mommy was right there to check on me. She knew it was coming but there was nothing she could do. I guess I need to be better in the store and stay with mommy next time.