After eating cereal that is full of sugar or chocolate, if you have milk left over, the milk will be very sugary or chocolatey. Some great cereals that do this are Fruity Pebbles, Cocoa Pebbles, Frosted Flakes. The ones with chocolate usually leave chocolate milk that is good, but not as good as real chocolate milk. The best is when you are at the end of the cereal box and all you have is powder, which dissolves straight into the milk.