Pinching a hole in a balloon filled with water creates a perfectly stationary stream of water. Why? In this situation, the flow is laminar, rather than turbulent. What this means is explained in this video.
Made by:
Jesper Duiker, Bas Tuin and Marieke Brugge
Sources:
Unmixing Color Machine (Ultra Laminar Reversible Flow) - Smarter Every Day 217 (https://youtu.be/j2_dJY_mIys)
I’m So Excited, The Pointer Sisters