This story was even featured in the New York Times. After wanting to spoof Inception, Trey Parker and Matt Stone couldn’t watch the movie in theatres, rent, or download the movie. They came across the spoof CollegeHumor.com made. They copied some part, and even apologized for the plagiarism. CollegeHumor is cool and they are set to meet up. Basically they all spoof how Inception is so complex the characters have no idea what’s really going on.
Here’s the original CollegeHumor.com skit, Inception Characters Don’t Understand Inception.
Here’s the original South Park Clip: