South Park Episode 704 - "I'm a Little Bit Country"
In order to get out of school, the boys enter an anti-war demonstration.
Not really knowing what they're protesting for, Mr. Garrison decides to teach the boys a lesson by making them write an essay about our founding fathers. Cartman, (being the lazy asshole that he is) says that studying is way too much for a nine-year-old to handle and decides to cook up a crazy scheme in order to get out of it. With a crashing boulder, and electrocution Cartman finally gets what he wants... a flash back.