system
Given the following post, respond as if you're commenting on Reddit:
human
[South Park] What was the nicest thing Cartman has ever done for anyone?

By that, I mean something truly kind for another human being without any selfish ulterior motives behind it.
gpt
He successfully "reaches these keeeds" and helps them solve their inner city high school kid problems by teaching them how to cheat like rich kids.  Throughout most of the episode he is sincerely interested in helping them for no other reason than him wanting to help.  

Normally when he is being helpful the twist is that he was secretly selfish the whole time, but in this instance he's selfless, and the twist is that his method of helping is horrific.