I never understood that silly look Ten and Rose gave each other after she mentioned the Dimension Cannon. Because it had already been established that she'd built it because the stars were going out and she believed only the Doctor could help. It was a moment when even a huge shipper like myself wanted to slap Rose on the face. I guess RTD wanted to make some point about how Ten lets Rose get away with things he'd never allow other people to do, but it was massively inconsistent with the Rose we saw in Turn Left and I was very cross with him. Way to pander to the Rose-haters, RTD!