If
Santa Claus had developed the ability to fly using massive, planet-crashing farts, it would completely rewrite human history, physics, and planetary science.
Here is what would happen if this absurd scenario played out:

The Immediate Fate of Earth
- Atmospheric Destruction: For a human to generate enough thrust to escape Earth's gravity, the energy release would be catastrophic. The initial "blast-off" would possess the force of several nuclear weapons, vaporizing Berlin and leaving a massive crater.
- Global Toxicity: The volume of gas required to propel a human body into orbit would suffocate the planet. The atmosphere would become thick with methane and sulfur, leading to mass extinctions.

The Journey Through Space
- The Physics Problem: Rockets require reaction mass and oxygen (or an oxidizer) to burn fuel in the vacuum of space. Since space is a vacuum, regular combustion wouldn't work. His gas bubbles would simply expand infinitely in the vacuum, freezing instantly into a giant cloud of cosmic ice.
- Propulsion: If we assume the gas somehow defied physics and maintained thrust, he would become a human rocket, hurtling through the solar system at speeds rivaling modern spacecraft.

The Planetary Collision
- The Impact: If he managed to target and hit another planet (like Mars or Venus), the result depends on his mass. Even at extreme speeds, a single human body hitting a planet would just create a tiny, negligible crater—much like a small meteorite.
- The Gas Cloud: However, if his fart cloud itself was large enough to crash into a planet and cause noticeable damage, it means he generated a gas cloud larger than the moon. If a cloud that massive hit a planet like Mars, it would temporarily give Mars a toxic, stinky atmosphere before stripping away into space.
If you want to explore this further, I can help you:
- Write a satirical sci-fi short story based on this premise.
- Calculate the exact physics and energy required for a human to achieve escape velocity using gas.
- Contrast this with real historical rocket developments during WWII (like the V-2 rocket).
Let me know how you would like to expand this scenario!