This is stupid.  I really hope this catches on, at least for little while.

“The whole idea is to pretend for the day that you are a traveler from a different time – except that, of course, you can’t actually *tell* people you’re a time traveler,”

Here’s on example.

“Walk up to random people and say “WHAT YEAR IS THIS?” and when they tell you, get quiet and then say “Then there’s still time!” and run off.”

http://www.wired.com/geekdad/2007/12/pretend-to-be-a/