Beavis and Butt-head

Anyone ever wonder how Mike Judge came up with Beavis and Butt-head or specifically the Beavis alter-ego, Cornholio? Well, I am guessing he had children. Ryder and Taggart have never seen Beavis and Butt-head but thought this was the funniest thing. It didn't help that Daddy kept encouraging by laughing hysterically.
What transpired next may be more concerning.....

If this were an episode it would probably have been named one of the following actual episode names: Beware of the Butt, No Laughing, Be All You Can Be, Naked Colony, Sporting Goods, Buff 'N' Stuff, Young Gifted and Crude, or Temporary Insanity.

What the heck is Ryder doing in the background?