South Park creators Matt Stone and Trey Parker have apologized for borrowing lines in a recent episode that spoofed Inception from a CollegeHumor video.

The South Park episode, titled "Insheeption," and a CollegeHumor video both featured the same lines that mocked the complexity of the film, but were not actually from the film. One line in particular —"Sometimes my thoughts of my dead wife manifest themselves as trains." — was exactly the same.

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Stone, unable to obtain the actual film, pulled the line from the CollegeHumor video thinking it was from the Christopher Nolan drama.

"It's just because we do the show in six days, and we're stupid and we just threw it together," Stone told the New York Times. "But in the end, there are some lines that we had to call and apologize for."

Dan Gurewitch and David Young, the creators of the College Humor video, said Stone was "extremely nice and apologetic." "All is well, and we're going to meet with Matt and Trey when they're in New York," Gurewitch wrote on his blog.