The Interdimensional Council of Stephens and Bobbys

The Interdimensional Council of Stephens and Bobbys is an interdimensional alliance of Stephen and Bobby pairs spanning countless parallel worlds. The council's stated purpose is to maintain the integrity and assure the continued existence of the Inside Joke List across all possible worlds.

The Lizzie Wars
Unfortunately, in a small subsection of worlds, Stephen and Bobby pairs have been severed due to the introduction of Lizzie. However, in the majority of worlds, the Inside Joke List persists.

Creationism vs. Memetic Mutation Controversy
Some Stephen and Bobby pairs believe in the creationist view of inside jokes, which states that inside jokes are created spontaneously through a process of brute creativity on the part of Stephen and Bobby. The alternative hypothesis states that inside jokes rather form due to a process of memetic mutation plus comedic selection. In other words, that Stephen and Bobby have a propensity to create variations of inside jokes followed by a pruning of the less clever and funny ones. The most hilarious permutations eventually make it on the list, thus perpetuating the evolutionary cycle.

Related Jokes
Although this is the reality of our multi-dimensional existence, it bares some similarities to something seen in Rick and Morty.