If the last person commits suicide he or she will be able to slap every human who has ever lived at that moment...but if the last person multiplies or hangs on as long as possible, they'll hug every person who has ever lived, or ever would, as well...unless humans sprung back up anyway of course, like they have who knows how many times before, rendering there being no actual last human, etc... 'Life finds a way' jeff goldbloom, Jurassic Park, so you know it's true...