We start enjoying life, I guess.
I dunno, but it has happened to untold billions and trillions of other life forms.
Death equals sadness. I'd like to think that while Earthlings are left sad, the life after death makes up for it, a grand on-going party type thing.
We merge into a kaleidoscope of liquid light. Finally, everybody gets to be a star.
When you cross over, all your pets are there to welcome you and finally you can talk to them and explain why you had to leave them in the apartment all day while you worked.