It also put paid to accusations that Tennant is trying to piggy back the success of Harry Potter when he puts glasses on.
You tended to feel that the stuff Tennant was saying about the glasses and the shoes was something he wanted added to this Doctors character as a tribute rather than being some sort of afterthought or rip off of another franchise!

Tennants comments about the sonic screwdriver were blatantly a bit of self mocking hunour!

I did find it strange though that Davidsons Doctor was so oblivious to the fact Tennant was a future regeneration.

Snarf is shit. His death will be rejoiced!