The River Turned to Blood

In Exodus 7, God begins His deliverance of Israel by bringing plagues on the Egyptians. The first plague was, in my opinion, one of the more impressive feats.

Exodus 7:20-21
So [Aaron] lifted up the rod and struck the waters that were in the river, in the sight of Pharaoh and in the sight of his servants. And all the waters that were in the river were turned to blood. The fish that were in the river died, the river stank, and the Egyptians could not drink the water of the river. So there was blood throughout all the land of Egypt.

Stop and think about seeing an entire river turn to blood before your eyes. Wouldn't that completely freak you out??