10-21-12: I'm playing in the living room with Dex and the girls are playing in the kitchen in their "spaceship" (which is really a diaper box). I heard a low, slow rumble coming from the kitchen...followed by giggles. I asked Maddie if she tooted, and in a very sly voice she said "No Mom...it was thunder". FYI...It's sunny and clear out, and there isn't a cloud in the sky