system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why getting water up your nose sucks so very, very much.

Whether its drinking, shower, or swimming pool, it all feels the same, and it's terrible. Obviously it's uncomfortable to get water where it shouldn't be, like the eyes or ears, but why does it feel so shitty when you get it up your nose?
gpt
Because water is not supposed to be there, quite literally. Pain is not just your body trying to fuck with you, pain is an indication that something is wrong and needs to be fixed. 

If there's water in your nose, then it is probably on the way to your lungs, and if lungs fill up with water - you drown. 

You know how sometimes you can choke on a gulp of water? That's literally when water gets in the wrong pipe. In your throat a single pipe (which is your mouth) separates into two: one to your stomach and one to your lungs. There's also a little cap on the lung pipe, it closes when you swallow stuff. Choking is when you accidentally breathe and swallow at the same time. The pain is an indicator that something is endangering your lungs. Coughing is your body's reaction and an attempt to remove the foreign object (whether it's water or food).