At the end of Cartman joins NAMBLA after Kenny dies, his mother gives birth to him again, they both comment on how the baby looks like him and even name him Kenny, his dad then says "this must be like the 50th time this has happened" followed by his mother correcting him with "52nd".
I never knew this, thank you so much for sharing this, I had a vasectomy Wednesday and my balls hurt but this has cheered me up no end.