The problem is not just the bottle though, right, it's that ketchup is a non-Newtonian fluid. https://www.scientificamerican.com/article/ketchup-is-not-just-a-

The problem is not just the bottle though, right, it's that ketchup is a non-Newtonian fluid. https://www.scientificamerican.com/article/ketchup-is-not-just-a-condiment-it-is-also-a-non-newtonian-fluid/ https://www.scientificamerican.com/article/ketchup-is-not-ju...