In the beginning, there were noodles. And these noodles gathered to form a ball of unliving worms. Or at least something that resemled worms. This ball found itself rolling, which gave it animation and it rolled into a pool filled with tomatoes, which squashed into paste once the noodles made contact with them. The tomato paste was magical of course because it needs to be for this story to go on. Anywho, the two quarters-made ball Spaghetti lived in peace and prosperity and for a time, it was good. (Yes, I’m copping the Animatrix out because I feel like it.)
Then, Flint Lockwood popped up.
He did so because I need him to provide me with a trigger to keep this story going. His weird machine thingy acted up on his command and it rained meat balls. Dozens of them. And they stuck themselves to the noodles, thus completing the Spaghetti monster. It then learned how to morph and extend its noodles into wings so it could fly and thus, the Flying Spaghetti Monster came to be.
Disclaimer: I do not own the Animatrix or Cloudy with a Chance of Meatballs. I’m too uncool to own something of their caliber.