Every now and then some Facebook friend of a friend believes that TODAY is the day that Marty McFly arrives in the future from 1985. And you have to tell them no, they fell for a hoax.
From now on I'm just going to send them to the Back to the Future Countdown page.
Although really they should know better because it's going to be a much bigger deal when October 21, 2015 does roll around than just somebody will mention it on Facebook.
We still don't have hoverboards (well, except for a useless prototype) or flying cars, but Back to the Future II did get somethings right.