The magnificent fart.
The average fart is a wondrous event. Let me demonstrate with a little experiment. Link the fingers of your two hands tightly together to make a little cup. Imagine that in the cup of your hands you have some water, some floating solids and some gas. Imagine the whole system is under pressure. Now try to open one of your fingers in such a way that you release only the gas, without letting any solid or liquid squirt out.
I really doubt that any device made by the human race could do this task, and keep on doing it for some 70 years. This is the magnificent job that your anal sphincter does some 10 times per day, without fail.