system
Given the following post, respond as if you're commenting on Reddit:
human
Why does water pouring make that weird folded shape?

I was pouring water from my water bottle into another to combine some halves I had left out and I noticed it came out in a specific foldy shape. It changed depending on how hard I was pouring it. Why does it do that?
gpt
The water coming out is not just experiencing gravity pulling it down, but also inertia (from it spinning around the top before coming out) and cohesion (a result of hydrogen bonding) between water molecules. Because the water molecules have a strong degree of cohesion, the faster water bits pull along the slower water bits. This can result in some interesting patterns or water appearing “stretched out”.