My favorite example of this life process is the Lancet liver fluke (Dicrocoelium dendriticum).
In short, as an adult the Lancet liver fluke spends its time in the liver of a cow or another grazing mammal. Here it mates and lays eggs, which are excreted in the host's feces.
A snail eats the poo, taking in the eggs at the same time. The eggs hatch in the snail and make their way into its digestive gland, where they asexually reproduce. They then travel to the surface of the snail's body. As a defensive maneuver, the snail walls the parasites up in cysts and coughs up the balls of slime...doing exactly what the parasites wanted it to do.
An ant comes along and gobbles up the fluke-laded slime balls. The flukes then spread out inside of the ant, with a couple of them setting up shop in the insect's head. When night approaches, the flukes take control.
They make the ant climb up a blade of grass and hold tight, waiting to be eaten by a grazing animal. If the ant is still alive at dawn, the flukes release their control and the ant goes about its day like normal (if the ant baked in the sun, the parasite would die, too). At night the flukes take over again and the cycle repeats until the ant becomes cattle food.
Essentially, Quebec's two long-time governing options, the Quebec Liberal Party and the Parti Quebecois, have invaded the heads of those who make up the Quebec electorate and make them vote for either one. It doesn't really matter for which one since the two political parties are in a symbiotic relationship: when one of them forms a government, the other waits for the inevitable moment when the ruling party falls from grace and the Quebec electorate chooses the other to become the new ruling party.
The cycle repeats over and over again.
Like the ants that serve the well being of the Lancet liver flukes by climbing up the blades of grass, Quebecers dutifully go to the polls when called upon to elect one of the two parasitic political parties.
That both parties are alleged to be fundamentally corrupt as documented by the revelations of the Charbonneau Commission doesn't really matter. Both parties have gotten into the heads of Quebecers and compel them to behave in a presricibed manner, leaving little choice but to decide between sovereignty or unbridled greed.
Once the election is over, the cycle begins anew.
I guess that the majority of Quebecers are not even aware that they are sacrificing the well-being of their collective future for the benefit of a few parasites.