What's so funny about that?

What's better than a little girl laughing hysterically? Nothing, I say! We took M and the dogs to the park the other evening for a family stroll, and the drive over there was even more fun than the walking. The black dog was in the back with M and she (the dog) had her head out the window. For some reason, and I really wish I knew why, M thought this was fantastically funny. Thank goodness she's still in diapers because I'm certain she must've peed herself, she was laughing so much. We were quite perplexed. What's so funny about a dog with it's head out the window? But you know how contagious laughing is. So there we all were, driving down the road, laughing. Well, the white dog wasn't laughing. She hardly seemed amused at all. But she did seem pleased that she got to ride on my lap instead of in the back with that pesky black dog and crazy little girl.