Thixotropic
Thixotropy: "the property of various gels of becoming fluid when disturbed (as by shaking)" - Websters
I present this to you not simply so I can quote the line: "Ketchup is frequently thixotropic."
Have you tried to climb a building recently only to find the paint still wet? You can find information about thixotropic paint at this Metafilter thread.
Photo by Elly Thompson



