Fan Theories Part 2: Pixar, Firefly, SpongeBob SquarePants, the Flintstones, the Jetsons, Richie Rich, and Casper the Friendly Ghost Mysteries

Was Firefly canceled by the US Government? Is Bikini Bottom a nuclear test site? Do the Flintstones and the Jetsons exist at the same time in the same universe? Are Richie Rich and Casper the Friendly Ghost the same person? Do all Pixar films exist in the same timeline?