How did this happen?

Okay, so Brandon left yesterday morning for the Alabama vs. Clemson game (and by the way Roll Tide!!) and I knew that I would have the kids by myself. No big deal right...I'm Supermom. Well, I was wrong. Those 2 fought and whined pretty much until I told them my plan. We were going to the movies, and since I had just bought some coupons, our ticket was one of the passes to get in free. Anyway, I was getting ready for our

2:30 movie and the kids were coloring in the kitchen. And I heard a body hit the floor and a horrible cry. I thought they've done it know one of them has critically injured the other. Much to my surprise, when I run into the kitchen Braden is sitting in the floor, under the table crying. Lexie proceeds to tell me that he fell out of the chair and hit his chin on the table. So, I scoop him and and give him some mommy luvin and he was fine. But, please tell me how you can just fall out of a chair and manage to hit your chin? And unassisted? I still am not convinced that Lexie didn't have anything to do with this. She getting very sneaky about fighting with Braden.