In a strange crossover BITD, Kenny Hotz from Kenny v. Spenny moved to LA to write for South Park while his show was still in production. And Trey & Matt started getting EP credits on KvS.

I recall Hotz talking about the stress of simply getting one of his ideas to air before he left because he was so out of his league (and Hotz is a pretty egotistical guy). Sort of like finally getting one of your SNL skits on the air. Can't recall if he actually succeeded.