-=~Simpsons Movie~=-

*SPOILERS*

Righto, I must say i enjoyed this film. But the skateboarding scene where bart tries to cover his 'Doodle' and it gets shown for a few seconds.
The plot is basically homer 'Destroys' springfield by putting pig poop into the pond, polluting it. The pond, Not the poop. And a massive ass done covers springfield...

Forget it, I'll copy the whole lot off wiki.

ENJOY!

Green Day is performing on Lake Springfield, where they fail to engage the audience in talking about the environment. They are killed when the pollution in the lake eats away at their barge, causing it to sink. At the funeral, Grampa has a vision of a great catastrophe to come, but only Marge listens. Lisa and an Irish boy named Colin hold a seminar entitled "An Irritating Truth", which convinces the town to clean up the lake. Meanwhile, Homer dares Bart to skateboard nude to Krusty Burger, but Bart is caught by Chief Wiggum. Ned Flanders comforts Bart after being humiliated, since Homer ignores him and adopts a pig. Homer keeps the pig's waste in an overflowing silo, which horrifies Marge, who tells Homer to dispose of it safely. While waiting in a line at the dump, Homer decides on a quicker means of disposal and dumps the silo into the lake, causing it to become more heavily polluted than before. Nearby, Flanders and Bart bond during a hike and discover a mutated squirrel, which is captured by the EPA. Russ Cargill, head of the EPA, tells President Schwarzenegger that Springfield is extremely polluted and the government must take drastic action and the EPA places Springfield in a giant glass dome.

The police discover Homer's silo in the lake, and an angry mob approaches the Simpson's home, burning it. The family escapes the dome through a sinkhole and flees to Alaska. Seeing the dome begin to crack and realizing the people of Springfield will escape, Russ Cargill manipulates the President into ordering the town's destruction. In Alaska, the Simpsons see a television advertisement with Tom Hanks promoting a new Grand Canyon, to be located where Springfield is. Marge and the kids decide that they must save the town, but Homer refuses to help the town that tried to kill him, his family abandon him and return to rescue Springfield. After a visit with a mysterious Inuit shaman, Homer has a vision and reaches an epiphany: to save himself and his family he must save Springfield. Meanwhile, Marge, Lisa, Maggie, and Bart are captured by Cargill and returned to Springfield. Cargill tells the people of Springfield that the town will be destroyed. A helicopter arrives, opens a hole at the top of the dome and lowers a bomb. Homer climbs the outside of the dome and descends, knocking the escaping townspeople and bomb off the rope. Homer notices a motorcycle, grabs Bart, and cycles up the side of the dome. Bart throws the bomb through the hole, detonating it and shattering the dome. The town praises Homer, who rides off with Marge on the motorbike into the sunset. The film ends with everyone restoring Springfield, including the Simpson's house, back to the way things were.

I said there was spoilers but no one listens...