Doctor Who thread II: "I should have a hat like that." [SPOILERS]

[Dr. Simon]

And you can pick the serial/episode because I feel generous. Or something.
And because you've seen all of them so you probably have an idea of things that would be interesting/good/easy to collaborate on/make me do something iconically me-ish.
Something that might (on the surface of things) cause us to have differing opinions maybe?

Hmmm, tricky choice, I'll have to have a think on this.