The 14" high T. Rex replica head ($73 on Amazon) gets pretty good reviews from the people who've bought it -- sounds like just the thing if you want to create the illusion that you're a time-traveling big game hunted.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.