Caution: Wet Road Ahead...

This is a pretty fantastic example of why this phenomena is called a 'flash flood'. This video was taken near Merriwa, Australia, and although I'm a fan of access to such footage, these folks were a little closer to the action than I would encourage anyone else to seek out. Although very muddy and silty, Kellick Creek is still exhibiting properties of a Newtonian fluid (no yield stress, so viscosity doesn't change with respect to the rate of flow) while the second video is just a fun example of a non-Newtonian fluid (viscosity changes with respect to the shear force or flow). Just a little "fun with fluids."