Comment: Already been done (Score 1) 288
I grew up near Alfred University, not far from Corning, NY. In addition to such things as space shuttle tiles and coal slurry, researchers there developed a glass with these exact properties, and tried to license it to Heinz. Much to their dismay, Heinz turned it down, as they were just about to launch an ad campaign demonstrating the superior quality of their high viscosity ketchup compared to cheaper brands, which could be poured from the bottle without smacking it.