If you were transported 500 years into the past, with no objects-no clothes or anything, how would you prove you’re from the future?  You don’t have much time to prove yourself, so inventions are pretty out of the question.  I found this question very hard to answer.  I have to admit that I’m not even sure I know what was happening in the world in the 1600’s.  If you weren’t royal or wealthy, you probably lived a hard life. People around you might find your incessant chatter suspicious and assume you’re possessed.  The only thing I can come up with, is music.  I’d sing for them.  What songs would you choose to save your life?  Halleluiah by Leonard Cohn, Imagine by John Lennon, Sweet Child O Mine by GnR, and a few Bob Dylan songs definitely come to mind.  I’d probably throw in the Macarena, for good measure.