My Own Little Harry Potter

We were shopping at Sam's Club one day, and Tanner and Mackenzie thought it would be fun to run around the store with their eyes closed. M was supposed to be leading T but apparently got too bored with that. So, T kept going with his eyes closed and no direction. He ran right into the corner of a metal podium. He came up to us and said that he had hit his head. His hand was over his forhead, so I told him to move his hand. Blood starting dripping all down his face and all over the ground. I rushed him into the bathroom, where about 10 people followed. We washed him up and got the bleeding to stop as much as possible. Then we wrapped up his head and headed for the clinic. He got 3 stitches right down the middle of his forhead. Now he looks like Harry Potter, which he of course thinks is very cool. We had to take him to the hospital for a CT. Luckily everything came back normal and no serious damage was done. What makes kids do the things they do?