I recently watch the episode 'Goobacks', the one where the people from the future come to the present day to find work. I thought the funniest South Park moment I have ever seen featured on this episode.
It was where Mr. Garrison was trying to teach the kids the Goobacks' language, and he says:
"The boy threw the red ball. Which in future speak, of course is [muffled mess]. Everyone say it with me:"
Children repeat it.
And then Jimmy tries it which sounds something like:
"Gwak ig ig ku qua igwerg"
I really can't put it into words to sound funny so I really hope you have seen the episode and can recall the moment. It had me thinking about it days after and it still made me burst out laughing.