I don't think we exist right now. We were destroyed billions of years ago when the first wave of alien von Neumman machines came our way and sterilised Earth. Earth doesn't exist any more either. Not long after the nanobots came, it was transformed bit by bit into a part of the galactic megagrid they were building for their matryoshka brain, which is now running an integalactic version of Farmville.
Well, it's always possible that this or another variation on this is happening, but until we can prove otherwise I'm going to consider any such event as not having happened yet, OR we haven't done it yet to anyone else.