Just watching some Eureka (love the show) and I am watching season 4 and they have this episode that made me ponder this question for you guys.
How would you establish that you were from the future, and not a spy (because in 1947 everything was a world of paranoid) if you were discovered to have several of todays unexplainable devices on you ie a cell phone, or some form of tech that would sure wow them in 1947.
I know nothing of sports, so quoting statistics would not help me there. And while quoting history sounds clever, it also could back fire if you seemed to know things that only made them more suspicious.
I'd be falling back on science myself.
What about you?