The Lord said to Moses, "Tell Aaron, 'Take your staff and stretch out your hand over the waters of Egypt—over the streams and canals, over the ponds and all the reservoirs—and they will turn to blood.' Blood will be everywhere in Egypt, even in vessels of wood and stone." Exodus 7:19
Since the ruling class in Egypt liked to enslave people, God, in his infinite wisdom, decided to make everyone's lives miserable. I think someone needs a hug.
