There must be a thread about this, but I couldn't find it. Or perhaps I just don't know how to work the forum search engine.
Anyway, I saw Bobb's hat on flight BA848 from Heathrow to Warsaw on Tuesday evening. Bobb appeared to have been through a Tardis and come out aged about 20. It also looked as if he was on his way to a stag party, or some such thing. And the hat disappeared, on his head, with a briefcase, into the toilet with him, and transformed itself into a purple t-shirt. How bizarre, how bizarre.