When I was younger, it was either Year 4 or Year 6 (I'm in Year 11 now,) I remember that we were having a lesson on probability. It was given a name with less syllables I'm sure, but what I remember about that lesson is that there was a line going from the things that "definitely could happen", and the things that "absolutely definitely couldn't happen". I don't think Santa Claus was on there given our ages, but I remember aliens being one given example. What I also remember thinking is something like "But they could exist!" Because we just don't know for absolutely damn cert. And thus, I come to God.
