Al Gore and Manbearpig

Southpark spoiler via wikipedia:

Al Gore visits the school, and talks about the terrible Manbearpig, which roams the earth. Manbearpig is either half-man, half-bear and half-pig, or half-man and half-bearpig. Stan's Dad says the former VP is desperate for attention; Stan feels sorry for him since he has no friends. Al Gore begins pestering Stan, however, and when Gore breaks down on the phone Stan agrees to go to a meeting about Manbearpig. Al Gore declares that Manbearpig is hiding in the Cave of the Winds, and when he explains they won't have to go to school the kids agree to go with him.

In the cave, Al Gore forces the kids to follow him off the path, and begins shooting wildly, causing a cave-in that leaves the kids trapped in the caverns. While there, the boys search for a way out, and Cartman discovers a small cavern filled with gold, pearls, and other treasure. He attempts to keep the others from finding it, and comes up with a plan to get the treasure out of the cave by ingesting it.

Meanwhile, a rescue team has assembled to find the boys, despite Al Gore's pleas that the caves should be filled with molten lead, as the children have undoubtedly been killed by Manbearpig and the beast must be killed. He then decides to divert the flow of a nearby stream in order to cause a flood that fills the cavern in an attempt to kill the monster. It is also revealed around this point, by the searchers, that the boys are probably near Smugglers' Den—a room full of fake treasure, serving as Cave of the Winds' photo op.

The boys, meanwhile, believe that Cartman—bloated with fake gold and jewels—is really sick, and try to find a way out, carrying him. The water soon floods, and Kyle actually risks his life to get Cartman to safety. The boys manage to escape just as a memorial is being held for them. They scream at Al Gore for using Manbearpig to get attention—he is too full of himself to care—and, when Cartman defecates all the gold—which he learns is fake—they scream at him too.