Old Butt-Head admits to (what he thinks is) a dying Beavis that he had sex with Beavis's mom. It was established in "Beavis & Butt-Head Do the Universe" that Smart Beavis was the only Beavis or Butt-Head in the entire multiverse to have ever scored.
It's obvious that it never happened and Butt-Head wants to insult Beavis.
It's obvious that it never happened and Butt-Head wants to insult Beavis.
In the hospital, Beavis and Butt-Head have identical vital readouts on the electronic monitors.