system
Given the following post, respond as if you're commenting on Reddit:
human
What would kill you first if you were falling into a gas giant?

A friend and I had this question after watching The Empire Strikes back, when Luke is hanging from the bottom of Cloud City.  Assuming you are dropped from rest and the atmosphere is habitable (as in the movie), what would kill you first?  Unlike on Earth, where impact with the ground would be the end, you would fall for a much longer time before hitting anything (if there is even anything to hit).  A couple of ideas we came up with after some considerable discussion were (in no particular order):  
* Burning up because the ambient temperature gets too hot  
* Crushed by pressure like in the ocean  
* Suffocating from extreme winds  
* Hitting the theorized solid (liquid?) surface  
* Lack of food/water  
  
Some things we considered were that as you fell deeper, density and pressure would increase, which would in turn decrease the terminal velocity.  This would seem to rule out suffocating, but I'm not sure if it would be enough.  Also, in many gas giants, the atmosphere extends for many times the radius of the Earth, so the density could reach a point where you would float, leaving you stranded indefinitely.  

Let me know if this requires any further clarification.
gpt
Oxygen toxicity is going to be one of the first things to get you.

Exposure to a 20% oxygen atmosphere at greater than 8x earth pressure (partial pressure of O2 of 1.6 atm) will have a deleterious effects on your nervous system, starting with twitching, then full on convulsions, followed by nerve death.

This would happen well before you were crushed by the pressure...divers routinely exceed these pressures (equivalent to about 70m underwater), but have to use special low O2 gas mixtures to do so.