"At the very beginning, the dimension was a point of infinite mass. I call this point..."
"The singularity?"
"The punchline."
"Huh?"
"When the punchline is hit, a dimensional Big Bang occurs. During the explosion, chuunibyou energy and retort energy are born. When these two energies mix, they form a meme. Memes are the foundation of all matter. From viruses to galaxies, everything in this dimension is made of memes."
"..."
"Later, we discovered that memes also attract one another. If a meme has too much mass and too great a density, it collapses into a hole with infinite mass and density. This hole is..."
"A black hole?"
"A brain hole."
"Huh?"
"Nothing can escape the pull of a brain hole, not even memes.
Memes can be swallowed by brain holes, or burst forth from them.
Brain holes can not only destroy dimensions, but create them as well.
When there are enough memes inside a brain hole, they fuse into a new point with infinite mass and density, which is..."
"The punchline?"
"Exactly!"
"I didn't study much, but don't try to fool me..."
P.S. The synopsis above borrows its inspiration from Ten Million Cold Jokes: The Movie 2.