The last time I went fishing I caught a cutthroat that wasn't very big, but the water levels in the Snake and Columbia Rivers dropped six feet when I took it out of the water. Being a true environmentalist I of course did catch and release; when I careful slipped that fish (a Yellowstone cutthroat, an endangered species) back in the water levels returned to normal.

However, the sudden drop grounded quite a few boats up around Portland and Astoria. With the lower water level in the rivers the Pacific came rushing in to fill the void which caused the collapse of several dams and bridges, to say nothing of the damage to towns and cities. Then after I put the fish back in the rivers ran the other way and I caused a tsunami that wiped out several Pacific islands and Thai and Indonesian villages. Fortunately, no one was hurt and all ended well.