You would not, but it's entirely possible that something else could be. The analogy is not man:pebble::you:universe. The analogy is man:pebble::universe:you.

You would not, but it's entirely possible that something else could be. The analogy is not man:pebble::you:universe. The analogy is man:pebble::universe:you. If the man had, by happenstance, picked up a different pebble, the current pebble would not be there (in the man's hand). If the universe had, by happenstance, slightly different constants, you would not be there (in the universe). Something else might be, but then, it might not: we really can't figure that out. The weak anthropic principle is basically survivor bias on an enormous scale.