So I did this earlier and I thought it was pretty dang spiffy. I thought it was great and so did some of my friends so I thought I'd share the magic with you guys lol. So post onto your facebook "whoa it worked" in some fashion or another, anything similar works too. Then wait 2-3 mins and post "ok guys, I'm going to try out my time machine. Wish me luck." or anything similar to saying your going to travel back in time.
Then sit back and watch people be amazed for a second, until they realize what you did lol. Enjoy!