Rocket engines are absurd.
You see this giant gout of flame? This is a test from refurbished engine parts from the F-1, the engine used in the Apollo program. This isn't the engine as a whole. No, this is JUST the gas generator, which burns propellant to drive a turbine to pump fuel. This is exhaust from the fuel pump. And it's terrifying.
Saturn V F-1 Engine Gas Generator Fires Up | NASA Marshall Space Flight Center Video [1:10]
https://www.youtube.com/watch?v=5IdJuq9KaZs