>>149089561
But in the context of the movie, we see their interests and personalities develop beforehand-- often at random. So it means that no matter how you try to raise your kid, they are destined to have a specific personality beforehand. That means something like Joe's interest in music was not developed on Earth, it was merely a switch being activated and he was always destined to love music. But that's also true for horrible traits such as being a warmonger or a serial killer. They even make a joke in the Great Before where a soul has a really intense, competitive personality and a Jerry says, "That's Earth's problem".