Can you keep a straight face?

One day I was walking home from school with my friend/neighbor, Julie. We some how got on the subject of "who can keep a straight face?" Of course, if you know me I can't keep a straight face for 10 seconds. I know, it's pretty pathetic. Since I lost, I told her I was going to make her laugh. So when I was about to say something she said exactly what I was thinking. And she started laughing, so I said, "See I made you laugh!" She was like, "No! I made myself laugh." Then, I bumped her and she bumped me and so on, so on. But, finally I was going in to bump her, and then she lifted her bag and bumped me. It hurt so bad, and all that pain was from a question of, "Can you keep a straight face?"