'That Sounds Like Sarah.'

Recently, my mom and I were talking together, when we heard a loud bump and the Doctor saying 'Ow!' in the next room. My mom called 'Are you alright?' and his reply came, 'Yes; I just bashed my head on the ceiling.' as though he had stubbed his toe or something! It was so calm, for a moment I didn't even realize he was saying something odd!:) He can be so casual about important or unusual things! It's like what he said to me when I hurt myself on the tumble dryer, or in 'The Sontaran Experiment', when Harry says they should look for Sarah, and they hear her scream, and the Doctor calmly says, 'That sounds like Sarah.' I like that line even more after finding out it was scripted as 'Oh, dear!' and Tom Baker changed it.;) I wonder why he doesn't take these moments like other people would? Maybe to him it's not important, because he's busy thinking about some alien invasion or something, and bumping his head on the ceiling and stuff doesn't matter when lives are at stake. It's not important, I guess. It all adds to the fun!:)