God and the Physicist
Explanation
The Joke
A physicist dies and meets God. The physicist immediately starts asking God questions about the fundamental nature of reality — not theological questions, but physics questions. God becomes increasingly uncomfortable as the physicist's questions reveal that God doesn't actually understand how His own creation works at a deep level.
The Humor
The comedy comes from the reversal of the expected dynamic. Meeting God is supposed to be the ultimate answer to all questions, but it turns out that God is more of an engineer than a theorist — He built the universe but doesn't fully understand the underlying math. This is analogous to how many people can use technology without understanding how it works.
It also plays on the trope that physicists are so single-minded that even meeting the Creator wouldn't satisfy their curiosity — they'd just want to drill deeper into the equations.
Context
This is one of many SMBC comics in the "God meets a specialist" format, where different professionals have hilariously different reactions to the afterlife based on their training.