This toy will mesmerize you. When inverted, the gooey fluid flows down slowly from top to bottom. Watch as the fluid begins to flow down, and touches bottom, and from there it gradually piles up. As the name suggests, it oozes down. This slowly moving fluid is called, in physics terms, highly viscous, because of how slowly it flows from one place to another. Water, on the other hand, is much less viscous because of how much easier it flows from one place to another. The viscosity of a fluid is a measure of its resistance to gradual deformation. Viscosity is due to the friction between fluid particles as the fluid moves.
Check out a video of the Ooze Tube:
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