It is such a social thing, laughing. Two thousand people in a room laughing is such a great buzz and they tend to laugh much more in a group.
If God creates a world of particles and waves, dancing in obedience to mathematical and physical laws, who are we to say that he cannot make use of those laws to cover the surface of a small planet with living creatures?
Any therapist will tell you that when you're ready, you will come out. To be outed means you weren't ready.