OOBLECK

If you don't know what oobleck is your life must be a bore. Oobleck is really fun! This is what you need.
Cornstarch, Water, Food Coloring (optional)
Take 2 cups of cornstarch and put it in a bowl. Put 1 1/2 cup of water in with the cornstarch. Mix it with a fork or with your hands. Then add food coloring and mix it again. Then play with it. YAY!