One might recall the riots in Cairo in 1952, after which the king was deposed in a military coup. The next year, the monarchy was abolished and in 1954, Gamal Abdel Nasser set up a leftist dictatorship which would rule Egypt until his death in 1970.
Everything that has happened in Egypt has indeed happened at least once before in Egypt. That is what I realized when I lived there. All those events in the Bible? They still happen.
Egypt is after all the worlds most ancient civilization. They have been ruled by a Pharaoh for millennia, interrupted by a few invaders. The army will pick a new ruler pretty soon, just like they did when Sadat was shot. The generals own most of the things of any value there, even the bottled Safi water.