I hear this "you can't calculate the odds for things that have already happened," but that's nonsense. In the case of the 10,000 heads-up pennies on the driveway, YOUR only argument against randomness would be a calculation of odds---
even though the pennies were already there when you arrived! In other words, only an idiot would NOT try to calculate the odds of this past event.
Wrong! Wrong! Wrong! In scenario you describe, the occurence of heads or tails has
already happened! There is no choice. There are no odds. The coin you describe exists on the ground either with tails up or heads up. The state of the coin has
already been determined.
That's just simple statistics 101.