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ooblick: /oo'blik/ [from the Dr. Seuss title "Bartholomew
   and the Oobleck"] n. A bizarre semi-liquid sludge made from
   cornstarch and water.  Enjoyed among hackers who make batches
   during playtime at parties for its amusing and extremely
   non-Newtonian behavior; it pours and splatters, but resists rapid
   motion like a solid and will even crack when hit by a hammer.
   Often found near lasers.

Here is a field-tested ooblick recipe contributed by GLS:

1 cup cornstarch 1 cup baking soda 3/4 cup water N drops of food coloring

This recipe isn't quite as non-Newtonian as a pure cornstarch ooblick, but has an appropriately slimy feel.

Some, however, insist that the notion of an ooblick *recipe* is far too mechanical, and that it is best to add the water in small increments so that the various mixed states the cornstarch goes through as it *becomes* ooblick can be grokked in fullness by many hands. For optional ingredients of this experience, see the "Ceremonial Chemicals" section of Appendix B.