It is interesting to see the mixture hard on the bottom of the ice cream container and then when you pick it up it starts stretching!
Fill a cup with cornflour and tip into the mixing bowl. Then measure out 1/4 cup of water and slowly add to the cornflour stirring all the time. When the cornflour and water have mixed together smoothly and there is no dry cornflour left on the sides of the bowl, tip the slimy mix into a washing up bowl. You can add things to the slime to make it more fun, such as glitter, beads or food colouring.
Plunge your hands into the slime and feel it change from hard and thick to soft and runny and back again.
I make it in an ice cream container and have only tried the food colouring.