The animated series is not for children. In fact, its goal seems to be to offend as many as possible as it presents the adventures of Stan, Kyle, Kenny and Cartman. The show has taken on Saddam Hussein, Osama bin Laden, politicians of every stripe and self-important celebrities. Oh, and Kenny is killed in many episodes.
a "Mount Rushmore" is a top 4 greatest or most impactful of something, but in this case, make it oddly specific.
rules: pick 4 for your mount rushmore, downvote the rest that are outside your rushmore